621161055 has 20 divisors (see below), whose sum is σ = 1113489432. Its totient is φ = 331285680.

The previous prime is 621160957. The next prime is 621161083. The reversal of 621161055 is 550161126.

It is a happy number.

It is not a de Polignac number, because 621161055 - 2¹⁰ = 621160031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 766461 + ... + 767270.

Almost surely, 2^621161055 is an apocalyptic number.

621161055 is a deficient number, since it is larger than the sum of its proper divisors (492328377).

621161055 is a wasteful number, since it uses less digits than its factorization.

621161055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533748 (or 1533739 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 621161055 is about 24923.1028365250. The cubic root of 621161055 is about 853.2338426522.

The spelling of 621161055 in words is "six hundred twenty-one million, one hundred sixty-one thousand, fifty-five".