1622651257 has 2 divisors, whose sum is σ = 1622651258. Its totient is φ = 1622651256.

The previous prime is 1622651237. The next prime is 1622651279. The reversal of 1622651257 is 7521562261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345128976 + 277522281 = 36676^2 + 16659^2 .

It is an emirp because it is prime and its reverse (7521562261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1622651257 - 2²³ = 1614262649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1622651237) 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, 811325628 + 811325629.

It is an arithmetic number, because the mean of its divisors is an integer number (811325629).

Almost surely, 2^1622651257 is an apocalyptic number.

It is an amenable number.

1622651257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622651257 is an equidigital number, since it uses as much as digits as its factorization.

1622651257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 1622651257 is about 40282.1456355046. The cubic root of 1622651257 is about 1175.1006419303.

The spelling of 1622651257 in words is "one billion, six hundred twenty-two million, six hundred fifty-one thousand, two hundred fifty-seven".