405164261 has 2 divisors, whose sum is σ = 405164262. Its totient is φ = 405164260.

The previous prime is 405164237. The next prime is 405164273. The reversal of 405164261 is 162461504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306460036 + 98704225 = 17506^2 + 9935^2 .

It is a cyclic number.

It is not a de Polignac number, because 405164261 - 2²⁶ = 338055397 is a prime.

It is a super-2 number, since 2×405164261² = 328316156783352242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405164231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202582130 + 202582131.

It is an arithmetic number, because the mean of its divisors is an integer number (202582131).

Almost surely, 2^405164261 is an apocalyptic number.

It is an amenable number.

405164261 is a deficient number, since it is larger than the sum of its proper divisors (1).

405164261 is an equidigital number, since it uses as much as digits as its factorization.

405164261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 405164261 is about 20128.6924811325. The cubic root of 405164261 is about 739.9636340785.

The spelling of 405164261 in words is "four hundred five million, one hundred sixty-four thousand, two hundred sixty-one".