331172649 has 18 divisors (see below), whose sum is σ = 484488810. Its totient is φ = 217961568.

The previous prime is 331172587. The next prime is 331172657. The reversal of 331172649 is 946271133.

331172649 is a `hidden beast` number, since 3 + 3 + 1 + 1 + 7 + 2 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 238146624 + 93026025 = 15432^2 + 9645^2 .

It is not a de Polignac number, because 331172649 - 2⁷ = 331172521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (331172449) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 514722 + ... + 515364.

It is an arithmetic number, because the mean of its divisors is an integer number (26916045).

Almost surely, 2^331172649 is an apocalyptic number.

It is an amenable number.

331172649 is a deficient number, since it is larger than the sum of its proper divisors (153316161).

331172649 is an frugal number, since it uses more digits than its factorization.

331172649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 735 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 331172649 is about 18198.1496037372. The cubic root of 331172649 is about 691.8598908038.

The spelling of 331172649 in words is "three hundred thirty-one million, one hundred seventy-two thousand, six hundred forty-nine".