621773131 has 4 divisors (see below), whose sum is σ = 710597872. Its totient is φ = 532948392.

The previous prime is 621773129. The next prime is 621773161. The reversal of 621773131 is 131377126.

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

It is a cyclic number.

It is not a de Polignac number, because 621773131 - 2¹ = 621773129 is a prime.

It is a super-2 number, since 2×621773131² = 773203652867086322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621773093 and 621773102.

It is not an unprimeable number, because it can be changed into a prime (621773101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44412360 + ... + 44412373.

It is an arithmetic number, because the mean of its divisors is an integer number (177649468).

Almost surely, 2^621773131 is an apocalyptic number.

621773131 is a deficient number, since it is larger than the sum of its proper divisors (88824741).

621773131 is an equidigital number, since it uses as much as digits as its factorization.

621773131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88824740.

The product of its digits is 5292, while the sum is 31.

The square root of 621773131 is about 24935.3791027929. The cubic root of 621773131 is about 853.5140021545.

The spelling of 621773131 in words is "six hundred twenty-one million, seven hundred seventy-three thousand, one hundred thirty-one".