261313131443 has 48 divisors (see below), whose sum is σ = 334494720000. Its totient is φ = 199676430720.

The previous prime is 261313131437. The next prime is 261313131449. The reversal of 261313131443 is 344131313162.

It is an interprime number because it is at equal distance from previous prime (261313131437) and next prime (261313131449).

It is not a de Polignac number, because 261313131443 - 2⁸ = 261313131187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261313131449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18659558 + ... + 18673556.

It is an arithmetic number, because the mean of its divisors is an integer number (6968640000).

Almost surely, 2^261313131443 is an apocalyptic number.

261313131443 is a deficient number, since it is larger than the sum of its proper divisors (73181588557).

261313131443 is a wasteful number, since it uses less digits than its factorization.

261313131443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14572 (or 14559 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The spelling of 261313131443 in words is "two hundred sixty-one billion, three hundred thirteen million, one hundred thirty-one thousand, four hundred forty-three".