125693989 has 2 divisors, whose sum is σ = 125693990. Its totient is φ = 125693988.

The previous prime is 125693983. The next prime is 125693993. The reversal of 125693989 is 989396521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115562500 + 10131489 = 10750^2 + 3183^2 .

It is a cyclic number.

It is not a de Polignac number, because 125693989 - 2⁵ = 125693957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125693983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62846994 + 62846995.

It is an arithmetic number, because the mean of its divisors is an integer number (62846995).

Almost surely, 2^125693989 is an apocalyptic number.

It is an amenable number.

125693989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125693989 is an equidigital number, since it uses as much as digits as its factorization.

125693989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 52.

The square root of 125693989 is about 11211.3330607917. Note that the first 3 decimals coincide. The cubic root of 125693989 is about 500.9236114997.

The spelling of 125693989 in words is "one hundred twenty-five million, six hundred ninety-three thousand, nine hundred eighty-nine".