405031261 has 2 divisors, whose sum is σ = 405031262. Its totient is φ = 405031260.

The previous prime is 405031243. The next prime is 405031271. The reversal of 405031261 is 162130504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279725625 + 125305636 = 16725^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 405031261 - 2²⁵ = 371476829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405031241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202515630 + 202515631.

It is an arithmetic number, because the mean of its divisors is an integer number (202515631).

Almost surely, 2^405031261 is an apocalyptic number.

It is an amenable number.

405031261 is a deficient number, since it is larger than the sum of its proper divisors (1).

405031261 is an equidigital number, since it uses as much as digits as its factorization.

405031261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 405031261 is about 20125.3884683004. The cubic root of 405031261 is about 739.8826579219.

Adding to 405031261 its reverse (162130504), we get a palindrome (567161765).

The spelling of 405031261 in words is "four hundred five million, thirty-one thousand, two hundred sixty-one".