31144178009 has 4 divisors (see below), whose sum is σ = 35593346304. Its totient is φ = 26695009716.

The previous prime is 31144178003. The next prime is 31144178011. The reversal of 31144178009 is 90087144113.

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 a de Polignac number, because none of the positive numbers 2^k-31144178009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31144178003) 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, 2224584137 + ... + 2224584150.

It is an arithmetic number, because the mean of its divisors is an integer number (8898336576).

Almost surely, 2^31144178009 is an apocalyptic number.

It is an amenable number.

31144178009 is a deficient number, since it is larger than the sum of its proper divisors (4449168295).

31144178009 is an equidigital number, since it uses as much as digits as its factorization.

31144178009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449168294.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 31144178009 in words is "thirty-one billion, one hundred forty-four million, one hundred seventy-eight thousand, nine".