691655043 has 32 divisors (see below), whose sum is σ = 1025474560. Its totient is φ = 412866720.

The previous prime is 691654987. The next prime is 691655051. The reversal of 691655043 is 340556196.

It is not a de Polignac number, because 691655043 - 2²⁶ = 624546179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691654992 and 691655010.

It is not an unprimeable number, because it can be changed into a prime (691655543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71430 + ... + 80532.

It is an arithmetic number, because the mean of its divisors is an integer number (32046080).

Almost surely, 2^691655043 is an apocalyptic number.

691655043 is a deficient number, since it is larger than the sum of its proper divisors (333819517).

691655043 is a wasteful number, since it uses less digits than its factorization.

691655043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9199.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 691655043 is about 26299.3354098540. The cubic root of 691655043 is about 884.3615440490.

The spelling of 691655043 in words is "six hundred ninety-one million, six hundred fifty-five thousand, forty-three".