318020661 has 96 divisors (see below), whose sum is σ = 580722688. Its totient is φ = 170061120.

The previous prime is 318020657. The next prime is 318020663. The reversal of 318020661 is 166020813.

It is not a de Polignac number, because 318020661 - 2² = 318020657 is a prime.

It is a super-2 number, since 2×318020661² = 202274281645753842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318020663) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1950966 + ... + 1951128.

Almost surely, 2^318020661 is an apocalyptic number.

318020661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

318020661 is a deficient number, since it is larger than the sum of its proper divisors (262702027).

318020661 is a wasteful number, since it uses less digits than its factorization.

318020661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 318020661 is about 17833.1337963915. The cubic root of 318020661 is about 682.5772017487.

The spelling of 318020661 in words is "three hundred eighteen million, twenty thousand, six hundred sixty-one".