1625979401 has 2 divisors, whose sum is σ = 1625979402. Its totient is φ = 1625979400.

The previous prime is 1625979323. The next prime is 1625979409. The reversal of 1625979401 is 1049795261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569744400 + 56235001 = 39620^2 + 7499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625979401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625979409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812989700 + 812989701.

It is an arithmetic number, because the mean of its divisors is an integer number (812989701).

Almost surely, 2^1625979401 is an apocalyptic number.

It is an amenable number.

1625979401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625979401 is an equidigital number, since it uses as much as digits as its factorization.

1625979401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 1625979401 is about 40323.4348859320. The cubic root of 1625979401 is about 1175.9034912491.

The spelling of 1625979401 in words is "one billion, six hundred twenty-five million, nine hundred seventy-nine thousand, four hundred one".