261421774634131 has 4 divisors (see below), whose sum is σ = 261442683370512. Its totient is φ = 261400865897752.

The previous prime is 261421774634101. The next prime is 261421774634171. The reversal of 261421774634131 is 131436477124162.

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

It is a cyclic number.

It is not a de Polignac number, because 261421774634131 - 2¹³ = 261421774625939 is a prime.

It is a super-2 number, since 2×261421774634131² (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 (261421774634101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10454349436 + ... + 10454374441.

It is an arithmetic number, because the mean of its divisors is an integer number (65360670842628).

Almost surely, 2^{261421774634131} is an apocalyptic number.

261421774634131 is a deficient number, since it is larger than the sum of its proper divisors (20908736381).

261421774634131 is a wasteful number, since it uses less digits than its factorization.

261421774634131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20908736380.

The product of its digits is 4064256, while the sum is 52.

The spelling of 261421774634131 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred seventy-four million, six hundred thirty-four thousand, one hundred thirty-one".