1110311131561 has 4 divisors (see below), whose sum is σ = 1110605882112. Its totient is φ = 1110016381012.

The previous prime is 1110311131541. The next prime is 1110311131577. The reversal of 1110311131561 is 1651311130111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1110311131561 - 2¹⁷ = 1110311000489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1110311131541) 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, 147369625 + ... + 147377158.

It is an arithmetic number, because the mean of its divisors is an integer number (277651470528).

Almost surely, 2^{1110311131561} is an apocalyptic number.

It is an amenable number.

1110311131561 is a deficient number, since it is larger than the sum of its proper divisors (294750551).

1110311131561 is an equidigital number, since it uses as much as digits as its factorization.

1110311131561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294750550.

The product of its (nonzero) digits is 270, while the sum is 25.

Adding to 1110311131561 its reverse (1651311130111), we get a palindrome (2761622261672).

The spelling of 1110311131561 in words is "one trillion, one hundred ten billion, three hundred eleven million, one hundred thirty-one thousand, five hundred sixty-one".