131021423431 has 8 divisors (see below), whose sum is σ = 132959232000. Its totient is φ = 129086182680.

The previous prime is 131021423419. The next prime is 131021423443. The reversal of 131021423431 is 134324120131.

It is an interprime number because it is at equal distance from previous prime (131021423419) and next prime (131021423443).

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 131021423431 - 2⁷ = 131021423303 is a prime.

It is a super-2 number, since 2×131021423431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021423396 and 131021423405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021423471) 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, 539031 + ... + 743368.

It is an arithmetic number, because the mean of its divisors is an integer number (16619904000).

Almost surely, 2^131021423431 is an apocalyptic number.

131021423431 is a deficient number, since it is larger than the sum of its proper divisors (1937808569).

131021423431 is a wasteful number, since it uses less digits than its factorization.

131021423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283909.

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

Adding to 131021423431 its reverse (134324120131), we get a palindrome (265345543562).

The spelling of 131021423431 in words is "one hundred thirty-one billion, twenty-one million, four hundred twenty-three thousand, four hundred thirty-one".