331145661 has 60 divisors (see below), whose sum is σ = 585459616. Its totient is φ = 162969840.

The previous prime is 331145629. The next prime is 331145663. The reversal of 331145661 is 166541133.

It is not a de Polignac number, because 331145661 - 2⁵ = 331145629 is a prime.

Its product of digits (6480) is a multiple of the sum of its prime divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331145663) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 17428710 + ... + 17428728.

Almost surely, 2^331145661 is an apocalyptic number.

It is an amenable number.

331145661 is a deficient number, since it is larger than the sum of its proper divisors (254313955).

331145661 is an frugal number, since it uses more digits than its factorization.

331145661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 40 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 331145661 is about 18197.4080846696. The cubic root of 331145661 is about 691.8410965566.

Adding to 331145661 its reverse (166541133), we get a palindrome (497686794).

The spelling of 331145661 in words is "three hundred thirty-one million, one hundred forty-five thousand, six hundred sixty-one".