125639653 has 2 divisors, whose sum is σ = 125639654. Its totient is φ = 125639652.

The previous prime is 125639623. The next prime is 125639659. The reversal of 125639653 is 356936521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109139809 + 16499844 = 10447^2 + 4062^2 .

It is a cyclic number.

It is not a de Polignac number, because 125639653 - 2⁹ = 125639141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125639659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62819826 + 62819827.

It is an arithmetic number, because the mean of its divisors is an integer number (62819827).

Almost surely, 2^125639653 is an apocalyptic number.

It is an amenable number.

125639653 is a deficient number, since it is larger than the sum of its proper divisors (1).

125639653 is an equidigital number, since it uses as much as digits as its factorization.

125639653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 40.

The square root of 125639653 is about 11208.9095366142. The cubic root of 125639653 is about 500.8514200117.

The spelling of 125639653 in words is "one hundred twenty-five million, six hundred thirty-nine thousand, six hundred fifty-three".