621187641 has 12 divisors (see below), whose sum is σ = 926215680. Its totient is φ = 400766040.

The previous prime is 621187639. The next prime is 621187643. The reversal of 621187641 is 146781126.

It is a happy number.

621187641 is a `hidden beast` number, since 6 + 2 + 1 + 1 + 8 + 7 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (621187639) and next prime (621187643).

It is not a de Polignac number, because 621187641 - 2¹ = 621187639 is a prime.

It is a super-2 number, since 2×621187641² = 771748170662289762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621187596 and 621187605.

It is not an unprimeable number, because it can be changed into a prime (621187643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1112961 + ... + 1113518.

It is an arithmetic number, because the mean of its divisors is an integer number (77184640).

Almost surely, 2^621187641 is an apocalyptic number.

It is an amenable number.

621187641 is a deficient number, since it is larger than the sum of its proper divisors (305028039).

621187641 is a wasteful number, since it uses less digits than its factorization.

621187641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226516 (or 2226513 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 621187641 is about 24923.6361913746. The cubic root of 621187641 is about 853.2460154219.

The spelling of 621187641 in words is "six hundred twenty-one million, one hundred eighty-seven thousand, six hundred forty-one".