131633428 has 6 divisors (see below), whose sum is σ = 230358506. Its totient is φ = 65816712.

The previous prime is 131633371. The next prime is 131633483. The reversal of 131633428 is 824336131.

It can be written as a sum of positive squares in only one way, i.e., 95296644 + 36336784 = 9762^2 + 6028^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131633428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16454175 + ... + 16454182.

Almost surely, 2^131633428 is an apocalyptic number.

It is an amenable number.

131633428 is a deficient number, since it is larger than the sum of its proper divisors (98725078).

131633428 is a wasteful number, since it uses less digits than its factorization.

131633428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32908361 (or 32908359 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 131633428 is about 11473.1612034347. The cubic root of 131633428 is about 508.6925732499.

Adding to 131633428 its reverse (824336131), we get a palindrome (955969559).

The spelling of 131633428 in words is "one hundred thirty-one million, six hundred thirty-three thousand, four hundred twenty-eight".