31143393071 has 4 divisors (see below), whose sum is σ = 35592449232. Its totient is φ = 26694336912.

The previous prime is 31143393053. The next prime is 31143393119. The reversal of 31143393071 is 17039334113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17039334113 = 13399 ⋅1271687.

It is a cyclic number.

It is not a de Polignac number, because 31143393071 - 2⁶ = 31143393007 is a prime.

It is a super-2 number, since 2×31143393071² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143993071) 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, 2224528070 + ... + 2224528083.

It is an arithmetic number, because the mean of its divisors is an integer number (8898112308).

Almost surely, 2^31143393071 is an apocalyptic number.

31143393071 is a deficient number, since it is larger than the sum of its proper divisors (4449056161).

31143393071 is an equidigital number, since it uses as much as digits as its factorization.

31143393071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449056160.

The product of its (nonzero) digits is 20412, while the sum is 35.

The spelling of 31143393071 in words is "thirty-one billion, one hundred forty-three million, three hundred ninety-three thousand, seventy-one".