620321131 has 2 divisors, whose sum is σ = 620321132. Its totient is φ = 620321130.

The previous prime is 620321089. The next prime is 620321159. The reversal of 620321131 is 131123026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620321131 - 2⁷ = 620321003 is a prime.

It is a super-2 number, since 2×620321131² = 769596611130238322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 620321099 and 620321108.

It is not a weakly prime, because it can be changed into another prime (620321171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310160565 + 310160566.

It is an arithmetic number, because the mean of its divisors is an integer number (310160566).

Almost surely, 2^620321131 is an apocalyptic number.

620321131 is a deficient number, since it is larger than the sum of its proper divisors (1).

620321131 is an equidigital number, since it uses as much as digits as its factorization.

620321131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 620321131 is about 24906.2468268505. The cubic root of 620321131 is about 852.8490928174.

Adding to 620321131 its reverse (131123026), we get a palindrome (751444157).

The spelling of 620321131 in words is "six hundred twenty million, three hundred twenty-one thousand, one hundred thirty-one".