31319720041 has 4 divisors (see below), whose sum is σ = 33162056532. Its totient is φ = 29477383552.

The previous prime is 31319720027. The next prime is 31319720083. The reversal of 31319720041 is 14002791313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14002791313 = 7 ⋅2000398759.

It can be written as a sum of positive squares in 2 ways, for example, as 21735310041 + 9584410000 = 147429^2 + 97900^2 .

It is a cyclic number.

It is not a de Polignac number, because 31319720041 - 2⁵ = 31319720009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31319719985 and 31319720012.

It is not an unprimeable number, because it can be changed into a prime (31319720021) 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, 921168220 + ... + 921168253.

It is an arithmetic number, because the mean of its divisors is an integer number (8290514133).

Almost surely, 2^31319720041 is an apocalyptic number.

It is an amenable number.

31319720041 is a deficient number, since it is larger than the sum of its proper divisors (1842336491).

31319720041 is a wasteful number, since it uses less digits than its factorization.

31319720041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842336490.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 31319720041 in words is "thirty-one billion, three hundred nineteen million, seven hundred twenty thousand, forty-one".