312978629 has 2 divisors, whose sum is σ = 312978630. Its totient is φ = 312978628.

The previous prime is 312978599. The next prime is 312978637. The reversal of 312978629 is 926879213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305305729 + 7672900 = 17473^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 312978629 - 2¹⁶ = 312913093 is a prime.

It is equal to p_16916798 and since 312978629 and 16916798 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312978649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156489314 + 156489315.

It is an arithmetic number, because the mean of its divisors is an integer number (156489315).

Almost surely, 2^312978629 is an apocalyptic number.

It is an amenable number.

312978629 is a deficient number, since it is larger than the sum of its proper divisors (1).

312978629 is an equidigital number, since it uses as much as digits as its factorization.

312978629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 312978629 is about 17691.2020224743. The cubic root of 312978629 is about 678.9506804856.

The spelling of 312978629 in words is "three hundred twelve million, nine hundred seventy-eight thousand, six hundred twenty-nine".