1626125989 has 2 divisors, whose sum is σ = 1626125990. Its totient is φ = 1626125988.

The previous prime is 1626125981. The next prime is 1626126043. The reversal of 1626125989 is 9895216261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1316964100 + 309161889 = 36290^2 + 17583^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626125989 - 2³ = 1626125981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1626125981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813062994 + 813062995.

It is an arithmetic number, because the mean of its divisors is an integer number (813062995).

Almost surely, 2^1626125989 is an apocalyptic number.

It is an amenable number.

1626125989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626125989 is an equidigital number, since it uses as much as digits as its factorization.

1626125989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 1626125989 is about 40325.2524976596. The cubic root of 1626125989 is about 1175.9388275232.

The spelling of 1626125989 in words is "one billion, six hundred twenty-six million, one hundred twenty-five thousand, nine hundred eighty-nine".