345631961 has 2 divisors, whose sum is σ = 345631962. Its totient is φ = 345631960.

The previous prime is 345631943. The next prime is 345631963. The reversal of 345631961 is 169136543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305550400 + 40081561 = 17480^2 + 6331^2 .

It is an emirp because it is prime and its reverse (169136543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345631961 is a prime.

It is a super-2 number, since 2×345631961² = 238922904929411042, which contains 22 as substring.

Together with 345631963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (345631963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172815980 + 172815981.

It is an arithmetic number, because the mean of its divisors is an integer number (172815981).

Almost surely, 2^345631961 is an apocalyptic number.

It is an amenable number.

345631961 is a deficient number, since it is larger than the sum of its proper divisors (1).

345631961 is an equidigital number, since it uses as much as digits as its factorization.

345631961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 38.

The square root of 345631961 is about 18591.1796559551. The cubic root of 345631961 is about 701.7858894975.

The spelling of 345631961 in words is "three hundred forty-five million, six hundred thirty-one thousand, nine hundred sixty-one".