1491557432 has 16 divisors (see below), whose sum is σ = 2797223640. Its totient is φ = 745631136.

The previous prime is 1491557413. The next prime is 1491557447. The reversal of 1491557432 is 2347551941.

It is a self number, because there is not a number n which added to its sum of digits gives 1491557432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32918 + ... + 63770.

Almost surely, 2^1491557432 is an apocalyptic number.

It is an amenable number.

1491557432 is a deficient number, since it is larger than the sum of its proper divisors (1305666208).

1491557432 is a wasteful number, since it uses less digits than its factorization.

1491557432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36902 (or 36898 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 1491557432 is about 38620.6865811575. The cubic root of 1491557432 is about 1142.5625722776.

The spelling of 1491557432 in words is "one billion, four hundred ninety-one million, five hundred fifty-seven thousand, four hundred thirty-two".