312163661 has 4 divisors (see below), whose sum is σ = 312322752. Its totient is φ = 312004572.

The previous prime is 312163609. The next prime is 312163667. The reversal of 312163661 is 166361213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312163661 - 2¹⁰ = 312162637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312163667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76565 + ... + 80538.

It is an arithmetic number, because the mean of its divisors is an integer number (78080688).

Almost surely, 2^312163661 is an apocalyptic number.

It is an amenable number.

312163661 is a deficient number, since it is larger than the sum of its proper divisors (159091).

312163661 is a wasteful number, since it uses less digits than its factorization.

312163661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159090.

The product of its digits is 3888, while the sum is 29.

The square root of 312163661 is about 17668.1538650760. The cubic root of 312163661 is about 678.3608595516.

The spelling of 312163661 in words is "three hundred twelve million, one hundred sixty-three thousand, six hundred sixty-one".