125145661 has 2 divisors, whose sum is σ = 125145662. Its totient is φ = 125145660.

The previous prime is 125145641. The next prime is 125145697. The reversal of 125145661 is 166541521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 58216900 = 8181^2 + 7630^2 .

It is a cyclic number.

It is not a de Polignac number, because 125145661 - 2⁹ = 125145149 is a prime.

It is a super-2 number, since 2×125145661² = 31322872934253842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125145611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62572830 + 62572831.

It is an arithmetic number, because the mean of its divisors is an integer number (62572831).

Almost surely, 2^125145661 is an apocalyptic number.

It is an amenable number.

125145661 is a deficient number, since it is larger than the sum of its proper divisors (1).

125145661 is an equidigital number, since it uses as much as digits as its factorization.

125145661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 125145661 is about 11186.8521488397. The cubic root of 125145661 is about 500.1941392768.

The spelling of 125145661 in words is "one hundred twenty-five million, one hundred forty-five thousand, six hundred sixty-one".