125557997 has 2 divisors, whose sum is σ = 125557998. Its totient is φ = 125557996.

The previous prime is 125557987. The next prime is 125558011. The reversal of 125557997 is 799755521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79941481 + 45616516 = 8941^2 + 6754^2 .

It is an emirp because it is prime and its reverse (799755521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125557997 - 2¹⁰ = 125556973 is a prime.

It is a super-2 number, since 2×125557997² = 31529621221304018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125557987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62778998 + 62778999.

It is an arithmetic number, because the mean of its divisors is an integer number (62778999).

Almost surely, 2^125557997 is an apocalyptic number.

It is an amenable number.

125557997 is a deficient number, since it is larger than the sum of its proper divisors (1).

125557997 is an equidigital number, since it uses as much as digits as its factorization.

125557997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 992250, while the sum is 50.

The square root of 125557997 is about 11205.2664850061. The cubic root of 125557997 is about 500.7428916773.

The spelling of 125557997 in words is "one hundred twenty-five million, five hundred fifty-seven thousand, nine hundred ninety-seven".