691204291423 has 2 divisors, whose sum is σ = 691204291424. Its totient is φ = 691204291422.

The previous prime is 691204291409. The next prime is 691204291471. The reversal of 691204291423 is 324192402196.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691204291423 is a prime.

It is a super-4 number, since 4×691204291423⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 691204291423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691204291403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345602145711 + 345602145712.

It is an arithmetic number, because the mean of its divisors is an integer number (345602145712).

Almost surely, 2^691204291423 is an apocalyptic number.

691204291423 is a deficient number, since it is larger than the sum of its proper divisors (1).

691204291423 is an equidigital number, since it uses as much as digits as its factorization.

691204291423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 691204291423 in words is "six hundred ninety-one billion, two hundred four million, two hundred ninety-one thousand, four hundred twenty-three".