131666772 has 24 divisors (see below), whose sum is σ = 311113600. Its totient is φ = 43333056.

The previous prime is 131666771. The next prime is 131666803. The reversal of 131666772 is 277666131.

It is a super-2 number, since 2×131666772² = 34672277697799968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131666772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131666771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68497 + ... + 70392.

Almost surely, 2^131666772 is an apocalyptic number.

131666772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131666772 is an abundant number, since it is smaller than the sum of its proper divisors (179446828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131666772 is a wasteful number, since it uses less digits than its factorization.

131666772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138975 (or 138973 counting only the distinct ones).

The product of its digits is 63504, while the sum is 39.

The square root of 131666772 is about 11474.6142418819. The cubic root of 131666772 is about 508.7355218469.

The spelling of 131666772 in words is "one hundred thirty-one million, six hundred sixty-six thousand, seven hundred seventy-two".