312305491 has 2 divisors, whose sum is σ = 312305492. Its totient is φ = 312305490.

The previous prime is 312305473. The next prime is 312305519. The reversal of 312305491 is 194503213.

It is an a-pointer prime, because the next prime (312305519) can be obtained adding 312305491 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312305491 - 2²³ = 303916883 is a prime.

It is not a weakly prime, because it can be changed into another prime (312300491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156152745 + 156152746.

It is an arithmetic number, because the mean of its divisors is an integer number (156152746).

Almost surely, 2^312305491 is an apocalyptic number.

312305491 is a deficient number, since it is larger than the sum of its proper divisors (1).

312305491 is an equidigital number, since it uses as much as digits as its factorization.

312305491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 312305491 is about 17672.1671280010. The cubic root of 312305491 is about 678.4635806188.

The spelling of 312305491 in words is "three hundred twelve million, three hundred five thousand, four hundred ninety-one".