621024981 has 4 divisors (see below), whose sum is σ = 828033312. Its totient is φ = 414016652.

The previous prime is 621024979. The next prime is 621025021. The reversal of 621024981 is 189420126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621024981 - 2¹ = 621024979 is a prime.

It is a super-2 number, since 2×621024981² = 771344054052100722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621022981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103504161 + ... + 103504166.

It is an arithmetic number, because the mean of its divisors is an integer number (207008328).

Almost surely, 2^621024981 is an apocalyptic number.

It is an amenable number.

621024981 is a deficient number, since it is larger than the sum of its proper divisors (207008331).

621024981 is a wasteful number, since it uses less digits than its factorization.

621024981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207008330.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 621024981 is about 24920.3728102129. The cubic root of 621024981 is about 853.1715338409.

The spelling of 621024981 in words is "six hundred twenty-one million, twenty-four thousand, nine hundred eighty-one".