1191474648 has 384 divisors, whose sum is σ = 4434393600. Its totient is φ = 279687168.

The previous prime is 1191474619. The next prime is 1191474653. The reversal of 1191474648 is 8464741911.

1191474648 is a `hidden beast` number, since 119 + 1 + 474 + 64 + 8 = 666.

It is a super-2 number, since 2×1191474648² = 2839223673653447808, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2116015 + ... + 2116577.

It is an arithmetic number, because the mean of its divisors is an integer number (11547900).

Almost surely, 2^1191474648 is an apocalyptic number.

1191474648 is a gapful number since it is divisible by the number (18) 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 1191474648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2217196800).

1191474648 is an abundant number, since it is smaller than the sum of its proper divisors (3242918952).

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

1191474648 is a wasteful number, since it uses less digits than its factorization.

1191474648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 624 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1191474648 is about 34517.7439587236. The cubic root of 1191474648 is about 1060.1360475671.

The spelling of 1191474648 in words is "one billion, one hundred ninety-one million, four hundred seventy-four thousand, six hundred forty-eight".