125501231257 has 2 divisors, whose sum is σ = 125501231258. Its totient is φ = 125501231256.

The previous prime is 125501231237. The next prime is 125501231269. The reversal of 125501231257 is 752132105521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90829301641 + 34671929616 = 301379^2 + 186204^2 .

It is a cyclic number.

It is not a de Polignac number, because 125501231257 - 2⁷ = 125501231129 is a prime.

It is not a weakly prime, because it can be changed into another prime (125501231237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62750615628 + 62750615629.

It is an arithmetic number, because the mean of its divisors is an integer number (62750615629).

Almost surely, 2^125501231257 is an apocalyptic number.

It is an amenable number.

125501231257 is a deficient number, since it is larger than the sum of its proper divisors (1).

125501231257 is an equidigital number, since it uses as much as digits as its factorization.

125501231257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 34.

Adding to 125501231257 its reverse (752132105521), we get a palindrome (877633336778).

The spelling of 125501231257 in words is "one hundred twenty-five billion, five hundred one million, two hundred thirty-one thousand, two hundred fifty-seven".