123220831 has 2 divisors, whose sum is σ = 123220832. Its totient is φ = 123220830.

The previous prime is 123220829. The next prime is 123220837. The reversal of 123220831 is 138022321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123220831 - 2¹ = 123220829 is a prime.

It is a super-2 number, since 2×123220831² = 30366746384661122, which contains 22 as substring.

Together with 123220829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123220837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610415 + 61610416.

It is an arithmetic number, because the mean of its divisors is an integer number (61610416).

Almost surely, 2^123220831 is an apocalyptic number.

123220831 is a deficient number, since it is larger than the sum of its proper divisors (1).

123220831 is an equidigital number, since it uses as much as digits as its factorization.

123220831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 123220831 is about 11100.4878721613. The cubic root of 123220831 is about 497.6164299100.

The spelling of 123220831 in words is "one hundred twenty-three million, two hundred twenty thousand, eight hundred thirty-one".