1691535216 has 160 divisors (see below), whose sum is σ = 5182747648. Its totient is φ = 465315840.

The previous prime is 1691535191. The next prime is 1691535221. The reversal of 1691535216 is 6125351961.

It is a happy number.

It is a super-2 number, since 2×1691535216² = 5722582773936333312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1279836 + ... + 1281156.

Almost surely, 2^1691535216 is an apocalyptic number.

1691535216 is a gapful number since it is divisible by the number (16) 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 1691535216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2591373824).

1691535216 is an abundant number, since it is smaller than the sum of its proper divisors (3491212432).

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

1691535216 is a wasteful number, since it uses less digits than its factorization.

1691535216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1473 counting only the distinct ones).

The product of its digits is 48600, while the sum is 39.

The square root of 1691535216 is about 41128.2775715201. The cubic root of 1691535216 is about 1191.4989974497.

The spelling of 1691535216 in words is "one billion, six hundred ninety-one million, five hundred thirty-five thousand, two hundred sixteen".