620891231 has 2 divisors, whose sum is σ = 620891232. Its totient is φ = 620891230.

The previous prime is 620891209. The next prime is 620891239. The reversal of 620891231 is 132198026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620891231 - 2¹⁴ = 620874847 is a prime.

It is a super-2 number, since 2×620891231² = 771011841465390722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620891239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310445615 + 310445616.

It is an arithmetic number, because the mean of its divisors is an integer number (310445616).

Almost surely, 2^620891231 is an apocalyptic number.

620891231 is a deficient number, since it is larger than the sum of its proper divisors (1).

620891231 is an equidigital number, since it uses as much as digits as its factorization.

620891231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 620891231 is about 24917.6891183753. The cubic root of 620891231 is about 853.1102803276.

The spelling of 620891231 in words is "six hundred twenty million, eight hundred ninety-one thousand, two hundred thirty-one".