1623621253 has 2 divisors, whose sum is σ = 1623621254. Its totient is φ = 1623621252.

The previous prime is 1623621191. The next prime is 1623621257. The reversal of 1623621253 is 3521263261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1418501569 + 205119684 = 37663^2 + 14322^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623621253 - 2⁹ = 1623620741 is a prime.

It is a super-2 number, since 2×1623621253² = 5272291946386580018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623621257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811810626 + 811810627.

It is an arithmetic number, because the mean of its divisors is an integer number (811810627).

Almost surely, 2^1623621253 is an apocalyptic number.

It is an amenable number.

1623621253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623621253 is an equidigital number, since it uses as much as digits as its factorization.

1623621253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 1623621253 is about 40294.1838607013. The cubic root of 1623621253 is about 1175.3347476602.

The spelling of 1623621253 in words is "one billion, six hundred twenty-three million, six hundred twenty-one thousand, two hundred fifty-three".