131205402 has 24 divisors (see below), whose sum is σ = 287476020. Its totient is φ = 43243200.

The previous prime is 131205391. The next prime is 131205419. The reversal of 131205402 is 204502131.

131205402 is a `hidden beast` number, since 1 + 3 + 120 + 540 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 128799801 + 2405601 = 11349^2 + 1551^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39349 + ... + 42552.

Almost surely, 2^131205402 is an apocalyptic number.

131205402 is an abundant number, since it is smaller than the sum of its proper divisors (156270618).

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

131205402 is a wasteful number, since it uses less digits than its factorization.

131205402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81998 (or 81995 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 131205402 is about 11454.4926557225. The cubic root of 131205402 is about 508.1406109409.

Adding to 131205402 its reverse (204502131), we get a palindrome (335707533).

The spelling of 131205402 in words is "one hundred thirty-one million, two hundred five thousand, four hundred two".