312890261 has 2 divisors, whose sum is σ = 312890262. Its totient is φ = 312890260.

The previous prime is 312890213. The next prime is 312890267. The reversal of 312890261 is 162098213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 60684100 = 15881^2 + 7790^2 .

It is a cyclic number.

It is not a de Polignac number, because 312890261 - 2¹⁰ = 312889237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312890267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156445130 + 156445131.

It is an arithmetic number, because the mean of its divisors is an integer number (156445131).

Almost surely, 2^312890261 is an apocalyptic number.

It is an amenable number.

312890261 is a deficient number, since it is larger than the sum of its proper divisors (1).

312890261 is an equidigital number, since it uses as much as digits as its factorization.

312890261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 312890261 is about 17688.7043335571. The cubic root of 312890261 is about 678.8867749920.

The spelling of 312890261 in words is "three hundred twelve million, eight hundred ninety thousand, two hundred sixty-one".