125561651 has 2 divisors, whose sum is σ = 125561652. Its totient is φ = 125561650.

The previous prime is 125561621. The next prime is 125561699. The reversal of 125561651 is 156165521.

It is a weak prime.

It is an emirp because it is prime and its reverse (156165521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125561651 - 2⁶ = 125561587 is a prime.

It is not a weakly prime, because it can be changed into another prime (125561621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62780825 + 62780826.

It is an arithmetic number, because the mean of its divisors is an integer number (62780826).

Almost surely, 2^125561651 is an apocalyptic number.

125561651 is a deficient number, since it is larger than the sum of its proper divisors (1).

125561651 is an equidigital number, since it uses as much as digits as its factorization.

125561651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 32.

The square root of 125561651 is about 11205.4295321509. The cubic root of 125561651 is about 500.7477491849.

The spelling of 125561651 in words is "one hundred twenty-five million, five hundred sixty-one thousand, six hundred fifty-one".