1691519004 has 144 divisors (see below), whose sum is σ = 5370220800. Its totient is φ = 457827552.

The previous prime is 1691519003. The next prime is 1691519021. The reversal of 1691519004 is 4009151961.

It is a super-2 number, since 2×1691519004² = 5722473081786304032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1691519004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691519003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92137 + ... + 108959.

It is an arithmetic number, because the mean of its divisors is an integer number (37293200).

Almost surely, 2^1691519004 is an apocalyptic number.

1691519004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691519004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2685110400).

1691519004 is an abundant number, since it is smaller than the sum of its proper divisors (3678701796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691519004 is a wasteful number, since it uses less digits than its factorization.

1691519004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16869 (or 16854 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1691519004 is about 41128.0804803725. The cubic root of 1691519004 is about 1191.4951909187.

The spelling of 1691519004 in words is "one billion, six hundred ninety-one million, five hundred nineteen thousand, four".