131403431221 has 8 divisors (see below), whose sum is σ = 132371970840. Its totient is φ = 130435027968.

The previous prime is 131403431177. The next prime is 131403431279. The reversal of 131403431221 is 122134304131.

It can be written as a sum of positive squares in 4 ways, for example, as 10751408721 + 120652022500 = 103689^2 + 347350^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131403431221 - 2¹³ = 131403423029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131403431921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2707315 + ... + 2755423.

It is an arithmetic number, because the mean of its divisors is an integer number (16546496355).

Almost surely, 2^131403431221 is an apocalyptic number.

It is an amenable number.

131403431221 is a deficient number, since it is larger than the sum of its proper divisors (968539619).

131403431221 is a wasteful number, since it uses less digits than its factorization.

131403431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68183.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 131403431221 its reverse (122134304131), we get a palindrome (253537735352).

The spelling of 131403431221 in words is "one hundred thirty-one billion, four hundred three million, four hundred thirty-one thousand, two hundred twenty-one".