131231130202 has 4 divisors (see below), whose sum is σ = 196846695306. Its totient is φ = 65615565100.

The previous prime is 131231130187. The next prime is 131231130241. The reversal of 131231130202 is 202031132131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83763357561 + 47467772641 = 289419^2 + 217871^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131231130202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32807782549 + ... + 32807782552.

Almost surely, 2^131231130202 is an apocalyptic number.

131231130202 is a deficient number, since it is larger than the sum of its proper divisors (65615565104).

131231130202 is an equidigital number, since it uses as much as digits as its factorization.

131231130202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65615565103.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 131231130202 its reverse (202031132131), we get a palindrome (333262262333).

The spelling of 131231130202 in words is "one hundred thirty-one billion, two hundred thirty-one million, one hundred thirty thousand, two hundred two".