125278961 has 2 divisors, whose sum is σ = 125278962. Its totient is φ = 125278960.

The previous prime is 125278931. The next prime is 125278973. The reversal of 125278961 is 169872521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104857600 + 20421361 = 10240^2 + 4519^2 .

It is a cyclic number.

It is not a de Polignac number, because 125278961 - 2¹⁸ = 125016817 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (125278921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62639480 + 62639481.

It is an arithmetic number, because the mean of its divisors is an integer number (62639481).

Almost surely, 2^125278961 is an apocalyptic number.

It is an amenable number.

125278961 is a deficient number, since it is larger than the sum of its proper divisors (1).

125278961 is an equidigital number, since it uses as much as digits as its factorization.

125278961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 125278961 is about 11192.8084500719. The cubic root of 125278961 is about 500.3716716519.

The spelling of 125278961 in words is "one hundred twenty-five million, two hundred seventy-eight thousand, nine hundred sixty-one".