345120631 has 2 divisors, whose sum is σ = 345120632. Its totient is φ = 345120630.

The previous prime is 345120599. The next prime is 345120637. The reversal of 345120631 is 136021543.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 345120631 - 2⁵ = 345120599 is a prime.

It is a super-2 number, since 2×345120631² = 238216499883676322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 345120596 and 345120605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345120637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172560315 + 172560316.

It is an arithmetic number, because the mean of its divisors is an integer number (172560316).

Almost surely, 2^345120631 is an apocalyptic number.

345120631 is a deficient number, since it is larger than the sum of its proper divisors (1).

345120631 is an equidigital number, since it uses as much as digits as its factorization.

345120631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 345120631 is about 18577.4226145609. The cubic root of 345120631 is about 701.4396432745.

The spelling of 345120631 in words is "three hundred forty-five million, one hundred twenty thousand, six hundred thirty-one".