1625406961 has 2 divisors, whose sum is σ = 1625406962. Its totient is φ = 1625406960.

The previous prime is 1625406949. The next prime is 1625407073. The reversal of 1625406961 is 1696045261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1624493025 + 913936 = 40305^2 + 956^2 .

It is an emirp because it is prime and its reverse (1696045261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1625406961 - 2²³ = 1617018353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625406931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812703480 + 812703481.

It is an arithmetic number, because the mean of its divisors is an integer number (812703481).

Almost surely, 2^1625406961 is an apocalyptic number.

It is an amenable number.

1625406961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625406961 is an equidigital number, since it uses as much as digits as its factorization.

1625406961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1625406961 is about 40316.3361554594. The cubic root of 1625406961 is about 1175.7654794138.

The spelling of 1625406961 in words is "one billion, six hundred twenty-five million, four hundred six thousand, nine hundred sixty-one".