131322402 has 12 divisors (see below), whose sum is σ = 284531910. Its totient is φ = 43774128.

The previous prime is 131322379. The next prime is 131322421. The reversal of 131322402 is 204223131.

It can be written as a sum of positive squares in only one way, i.e., 110061081 + 21261321 = 10491^2 + 4611^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 7295689 = 131322402 / (1 + 3 + 1 + 3 + 2 + 2 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3647827 + ... + 3647862.

Almost surely, 2^131322402 is an apocalyptic number.

131322402 is an abundant number, since it is smaller than the sum of its proper divisors (153209508).

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

131322402 is a wasteful number, since it uses less digits than its factorization.

131322402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7295697 (or 7295694 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 131322402 is about 11459.5986840727. The cubic root of 131322402 is about 508.2916077430.

Adding to 131322402 its reverse (204223131), we get a palindrome (335545533).

The spelling of 131322402 in words is "one hundred thirty-one million, three hundred twenty-two thousand, four hundred two".