621889031 has 4 divisors (see below), whose sum is σ = 625325064. Its totient is φ = 618453000.

The previous prime is 621888997. The next prime is 621889043. The reversal of 621889031 is 130988126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130988126 = 2 ⋅65494063.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621889031 is a prime.

It is a super-2 number, since 2×621889031² = 773491933756237922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621889061) 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, 1717745 + ... + 1718106.

It is an arithmetic number, because the mean of its divisors is an integer number (156331266).

Almost surely, 2^621889031 is an apocalyptic number.

621889031 is a deficient number, since it is larger than the sum of its proper divisors (3436033).

621889031 is a wasteful number, since it uses less digits than its factorization.

621889031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436032.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 621889031 is about 24937.7030016800. The cubic root of 621889031 is about 853.5670312108.

The spelling of 621889031 in words is "six hundred twenty-one million, eight hundred eighty-nine thousand, thirty-one".