31540440011 has 4 divisors (see below), whose sum is σ = 32075023800. Its totient is φ = 31005856224.

The previous prime is 31540439993. The next prime is 31540440023. The reversal of 31540440011 is 11004404513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11004404513 = 4951 ⋅2222663.

It is a cyclic number.

It is not a de Polignac number, because 31540440011 - 2²² = 31536245707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540440091) 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, 267291806 + ... + 267291923.

It is an arithmetic number, because the mean of its divisors is an integer number (8018755950).

Almost surely, 2^31540440011 is an apocalyptic number.

31540440011 is a deficient number, since it is larger than the sum of its proper divisors (534583789).

31540440011 is an equidigital number, since it uses as much as digits as its factorization.

31540440011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534583788.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31540440011 its reverse (11004404513), we get a palindrome (42544844524).

The spelling of 31540440011 in words is "thirty-one billion, five hundred forty million, four hundred forty thousand, eleven".