691204291439 has 12 divisors (see below), whose sum is σ = 734319916464. Its totient is φ = 650487769344.

The previous prime is 691204291423. The next prime is 691204291471. The reversal of 691204291439 is 934192402196.

It is not a de Polignac number, because 691204291439 - 2⁴ = 691204291423 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691204291409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3370427 + ... + 3569619.

It is an arithmetic number, because the mean of its divisors is an integer number (61193326372).

Almost surely, 2^691204291439 is an apocalyptic number.

691204291439 is a deficient number, since it is larger than the sum of its proper divisors (43115625025).

691204291439 is a wasteful number, since it uses less digits than its factorization.

691204291439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211234 (or 211217 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 691204291439 in words is "six hundred ninety-one billion, two hundred four million, two hundred ninety-one thousand, four hundred thirty-nine".