1131445321551 has 6 divisors (see below), whose sum is σ = 1634309908920. Its totient is φ = 754296881028.

The previous prime is 1131445321547. The next prime is 1131445321577. The reversal of 1131445321551 is 1551235441311.

1131445321551 is a `hidden beast` number, since 1 + 1 + 31 + 4 + 4 + 53 + 21 + 551 = 666.

It is not a de Polignac number, because 1131445321551 - 2² = 1131445321547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131445321541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62858073411 + ... + 62858073428.

It is an arithmetic number, because the mean of its divisors is an integer number (272384984820).

Almost surely, 2^{1131445321551} is an apocalyptic number.

1131445321551 is a deficient number, since it is larger than the sum of its proper divisors (502864587369).

1131445321551 is a wasteful number, since it uses less digits than its factorization.

1131445321551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125716146845 (or 125716146842 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The spelling of 1131445321551 in words is "one trillion, one hundred thirty-one billion, four hundred forty-five million, three hundred twenty-one thousand, five hundred fifty-one".