1625361121 has 2 divisors, whose sum is σ = 1625361122. Its totient is φ = 1625361120.

The previous prime is 1625361119. The next prime is 1625361139. The reversal of 1625361121 is 1211635261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1624976721 + 384400 = 40311^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625361121 - 2¹ = 1625361119 is a prime.

Together with 1625361119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1625361121.

It is not a weakly prime, because it can be changed into another prime (1625361161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812680560 + 812680561.

It is an arithmetic number, because the mean of its divisors is an integer number (812680561).

Almost surely, 2^1625361121 is an apocalyptic number.

It is an amenable number.

1625361121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625361121 is an equidigital number, since it uses as much as digits as its factorization.

1625361121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 1625361121 is about 40315.7676474106. The cubic root of 1625361121 is about 1175.7544262647.

Adding to 1625361121 its reverse (1211635261), we get a palindrome (2836996382).

The spelling of 1625361121 in words is "one billion, six hundred twenty-five million, three hundred sixty-one thousand, one hundred twenty-one".