621160081 has 4 divisors (see below), whose sum is σ = 623144932. Its totient is φ = 619175232.

The previous prime is 621160079. The next prime is 621160087. The reversal of 621160081 is 180061126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 252174400 + 368985681 = 15880^2 + 19209^2 .

It is a cyclic number.

It is not a de Polignac number, because 621160081 - 2¹ = 621160079 is a prime.

It is a super-2 number, since 2×621160081² = 771679692455853122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621160087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991956 + ... + 992581.

It is an arithmetic number, because the mean of its divisors is an integer number (155786233).

Almost surely, 2^621160081 is an apocalyptic number.

It is an amenable number.

621160081 is a deficient number, since it is larger than the sum of its proper divisors (1984851).

621160081 is a wasteful number, since it uses less digits than its factorization.

621160081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984850.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 621160081 is about 24923.0832964142. The cubic root of 621160081 is about 853.2333966862.

The spelling of 621160081 in words is "six hundred twenty-one million, one hundred sixty thousand, eighty-one".