1621252253 has 2 divisors, whose sum is σ = 1621252254. Its totient is φ = 1621252252.

The previous prime is 1621252231. The next prime is 1621252301. The reversal of 1621252253 is 3522521261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1030859449 + 590392804 = 32107^2 + 24298^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621252253 - 2²⁸ = 1352816797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621252153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810626126 + 810626127.

It is an arithmetic number, because the mean of its divisors is an integer number (810626127).

Almost surely, 2^1621252253 is an apocalyptic number.

It is an amenable number.

1621252253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621252253 is an equidigital number, since it uses as much as digits as its factorization.

1621252253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 1621252253 is about 40264.7768278926. The cubic root of 1621252253 is about 1174.7628319872.

The spelling of 1621252253 in words is "one billion, six hundred twenty-one million, two hundred fifty-two thousand, two hundred fifty-three".