125688551 has 2 divisors, whose sum is σ = 125688552. Its totient is φ = 125688550.

The previous prime is 125688547. The next prime is 125688557. The reversal of 125688551 is 155886521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125688551 - 2² = 125688547 is a prime.

It is a super-2 number, since 2×125688551² = 31595223704959202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125688499 and 125688508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125688557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62844275 + 62844276.

It is an arithmetic number, because the mean of its divisors is an integer number (62844276).

Almost surely, 2^125688551 is an apocalyptic number.

125688551 is a deficient number, since it is larger than the sum of its proper divisors (1).

125688551 is an equidigital number, since it uses as much as digits as its factorization.

125688551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96000, while the sum is 41.

The square root of 125688551 is about 11211.0905357151. The cubic root of 125688551 is about 500.9163874420.

The spelling of 125688551 in words is "one hundred twenty-five million, six hundred eighty-eight thousand, five hundred fifty-one".