621029477 has 2 divisors, whose sum is σ = 621029478. Its totient is φ = 621029476.

The previous prime is 621029447. The next prime is 621029483. The reversal of 621029477 is 774920126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453093796 + 167935681 = 21286^2 + 12959^2 .

It is a cyclic number.

It is not a de Polignac number, because 621029477 - 2¹⁰ = 621028453 is a prime.

It is a super-2 number, since 2×621029477² = 771355222605787058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621029477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621029447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310514738 + 310514739.

It is an arithmetic number, because the mean of its divisors is an integer number (310514739).

Almost surely, 2^621029477 is an apocalyptic number.

It is an amenable number.

621029477 is a deficient number, since it is larger than the sum of its proper divisors (1).

621029477 is an equidigital number, since it uses as much as digits as its factorization.

621029477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 621029477 is about 24920.4630173679. The cubic root of 621029477 is about 853.1735927221.

The spelling of 621029477 in words is "six hundred twenty-one million, twenty-nine thousand, four hundred seventy-seven".