621520053 has 32 divisors (see below), whose sum is σ = 1078106112. Its totient is φ = 308827200.

The previous prime is 621520021. The next prime is 621520063. The reversal of 621520053 is 350025126.

It is not a de Polignac number, because 621520053 - 2⁵ = 621520021 is a prime.

It is a super-2 number, since 2×621520053² = 772574352562245618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621520063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53178 + ... + 63803.

It is an arithmetic number, because the mean of its divisors is an integer number (33690816).

Almost surely, 2^621520053 is an apocalyptic number.

It is an amenable number.

621520053 is a deficient number, since it is larger than the sum of its proper divisors (456586059).

621520053 is a wasteful number, since it uses less digits than its factorization.

621520053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117025.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 621520053 is about 24930.3039090983. The cubic root of 621520053 is about 853.3981855653.

Adding to 621520053 its reverse (350025126), we get a palindrome (971545179).

The spelling of 621520053 in words is "six hundred twenty-one million, five hundred twenty thousand, fifty-three".