1261371387431 has 8 divisors (see below), whose sum is σ = 1293143718384. Its totient is φ = 1229647017280.

The previous prime is 1261371387391. The next prime is 1261371387443. The reversal of 1261371387431 is 1347831731621.

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 1261371387431 - 2²⁶ = 1261304278567 is a prime.

It is a super-2 number, since 2×1261371387431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261371384431) 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, 11936936 + ... + 12042141.

It is an arithmetic number, because the mean of its divisors is an integer number (161642964798).

Almost surely, 2^{1261371387431} is an apocalyptic number.

1261371387431 is a deficient number, since it is larger than the sum of its proper divisors (31772330953).

1261371387431 is a wasteful number, since it uses less digits than its factorization.

1261371387431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23980401.

The product of its digits is 508032, while the sum is 47.

The spelling of 1261371387431 in words is "one trillion, two hundred sixty-one billion, three hundred seventy-one million, three hundred eighty-seven thousand, four hundred thirty-one".