31143081 has 16 divisors (see below), whose sum is σ = 43462656. Its totient is φ = 19798416.

The previous prime is 31143061. The next prime is 31143083. The reversal of 31143081 is 18034113.

It is not a de Polignac number, because 31143081 - 2⁶ = 31143017 is a prime.

It is a super-2 number, since 2×31143081² = 1939782988345122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31143083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35656 + ... + 36518.

It is an arithmetic number, because the mean of its divisors is an integer number (2716416).

Almost surely, 2^31143081 is an apocalyptic number.

It is an amenable number.

31143081 is a deficient number, since it is larger than the sum of its proper divisors (12319575).

31143081 is a wasteful number, since it uses less digits than its factorization.

31143081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 31143081 is about 5580.5986238037. The cubic root of 31143081 is about 314.6206266778.

Adding to 31143081 its reverse (18034113), we get a palindrome (49177194).

It can be divided in two parts, 3 and 1143081, that multiplied together give a palindrome (3429243).

The spelling of 31143081 in words is "thirty-one million, one hundred forty-three thousand, eighty-one".