621451131 has 8 divisors (see below), whose sum is σ = 946973184. Its totient is φ = 355114920.

The previous prime is 621451123. The next prime is 621451147. The reversal of 621451131 is 131154126.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621451131 - 2³ = 621451123 is a prime.

It is a super-2 number, since 2×621451131² = 772403016442358322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621051131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14796435 + ... + 14796476.

It is an arithmetic number, because the mean of its divisors is an integer number (118371648).

Almost surely, 2^621451131 is an apocalyptic number.

621451131 is a deficient number, since it is larger than the sum of its proper divisors (325522053).

621451131 is a wasteful number, since it uses less digits than its factorization.

621451131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29592921.

The product of its digits is 720, while the sum is 24.

The square root of 621451131 is about 24928.9215771561. The cubic root of 621451131 is about 853.3666392064.

The spelling of 621451131 in words is "six hundred twenty-one million, four hundred fifty-one thousand, one hundred thirty-one".