621657153 has 16 divisors (see below), whose sum is σ = 991818240. Its totient is φ = 382558032.

The previous prime is 621657103. The next prime is 621657163. The reversal of 621657153 is 351756126.

It is not a de Polignac number, because 621657153 - 2¹³ = 621648961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621657103) 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 in 15 ways as a sum of consecutive naturals, for example, 885201 + ... + 885902.

It is an arithmetic number, because the mean of its divisors is an integer number (61988640).

Almost surely, 2^621657153 is an apocalyptic number.

It is an amenable number.

621657153 is a deficient number, since it is larger than the sum of its proper divisors (370161087).

621657153 is a wasteful number, since it uses less digits than its factorization.

621657153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771125 (or 1771119 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 621657153 is about 24933.0534231169. The cubic root of 621657153 is about 853.4609308131.

The spelling of 621657153 in words is "six hundred twenty-one million, six hundred fifty-seven thousand, one hundred fifty-three".