312032261 has 2 divisors, whose sum is σ = 312032262. Its totient is φ = 312032260.

The previous prime is 312032251. The next prime is 312032311. The reversal of 312032261 is 162230213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157502500 + 154529761 = 12550^2 + 12431^2 .

It is a cyclic number.

It is not a de Polignac number, because 312032261 - 2⁶ = 312032197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312032251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156016130 + 156016131.

It is an arithmetic number, because the mean of its divisors is an integer number (156016131).

Almost surely, 2^312032261 is an apocalyptic number.

It is an amenable number.

312032261 is a deficient number, since it is larger than the sum of its proper divisors (1).

312032261 is an equidigital number, since it uses as much as digits as its factorization.

312032261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 312032261 is about 17664.4349187853. The cubic root of 312032261 is about 678.2656646930.

Adding to 312032261 its reverse (162230213), we get a palindrome (474262474).

The spelling of 312032261 in words is "three hundred twelve million, thirty-two thousand, two hundred sixty-one".