1161531744451 has 4 divisors (see below), whose sum is σ = 1250880340192. Its totient is φ = 1072183148712.

The previous prime is 1161531744449. The next prime is 1161531744467. The reversal of 1161531744451 is 1544471351611.

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

It is not a de Polignac number, because 1161531744451 - 2¹ = 1161531744449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161531744398 and 1161531744407.

It is not an unprimeable number, because it can be changed into a prime (1161531744551) 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, 44674297851 + ... + 44674297876.

It is an arithmetic number, because the mean of its divisors is an integer number (312720085048).

Almost surely, 2^{1161531744451} is an apocalyptic number.

1161531744451 is a deficient number, since it is larger than the sum of its proper divisors (89348595741).

1161531744451 is an equidigital number, since it uses as much as digits as its factorization.

1161531744451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89348595740.

The product of its digits is 201600, while the sum is 43.

The spelling of 1161531744451 in words is "one trillion, one hundred sixty-one billion, five hundred thirty-one million, seven hundred forty-four thousand, four hundred fifty-one".