316156661 has 2 divisors, whose sum is σ = 316156662. Its totient is φ = 316156660.

The previous prime is 316156627. The next prime is 316156723. The reversal of 316156661 is 166651613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266016100 + 50140561 = 16310^2 + 7081^2 .

It is a cyclic number.

It is not a de Polignac number, because 316156661 - 2²⁶ = 249047797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316156261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158078330 + 158078331.

It is an arithmetic number, because the mean of its divisors is an integer number (158078331).

Almost surely, 2^316156661 is an apocalyptic number.

It is an amenable number.

316156661 is a deficient number, since it is larger than the sum of its proper divisors (1).

316156661 is an equidigital number, since it uses as much as digits as its factorization.

316156661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 316156661 is about 17780.7947235212. The cubic root of 316156661 is about 681.2410015252.

The spelling of 316156661 in words is "three hundred sixteen million, one hundred fifty-six thousand, six hundred sixty-one".