261431274502531 has 8 divisors (see below), whose sum is σ = 298779303041280. Its totient is φ = 224083421866248.

The previous prime is 261431274502507. The next prime is 261431274502549. The reversal of 261431274502531 is 135205472134162.

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

It is not a de Polignac number, because 261431274502531 - 2¹¹ = 261431274500483 is a prime.

It is a super-2 number, since 2×261431274502531² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261431274508531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40775311 + ... + 46749208.

It is an arithmetic number, because the mean of its divisors is an integer number (37347412880160).

Almost surely, 2^{261431274502531} is an apocalyptic number.

261431274502531 is a deficient number, since it is larger than the sum of its proper divisors (37348028538749).

261431274502531 is an equidigital number, since it uses as much as digits as its factorization.

261431274502531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87951233.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 261431274502531 in words is "two hundred sixty-one trillion, four hundred thirty-one billion, two hundred seventy-four million, five hundred two thousand, five hundred thirty-one".