691458025429 has 2 divisors, whose sum is σ = 691458025430. Its totient is φ = 691458025428.

The previous prime is 691458025421. The next prime is 691458025543. The reversal of 691458025429 is 924520854196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594746355204 + 96711670225 = 771198^2 + 310985^2 .

It is a cyclic number.

It is not a de Polignac number, because 691458025429 - 2³ = 691458025421 is a prime.

It is a super-2 number, since 2×691458025429² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 691458025429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691458025421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345729012714 + 345729012715.

It is an arithmetic number, because the mean of its divisors is an integer number (345729012715).

Almost surely, 2^691458025429 is an apocalyptic number.

It is an amenable number.

691458025429 is a deficient number, since it is larger than the sum of its proper divisors (1).

691458025429 is an equidigital number, since it uses as much as digits as its factorization.

691458025429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 691458025429 in words is "six hundred ninety-one billion, four hundred fifty-eight million, twenty-five thousand, four hundred twenty-nine".