31143493 has 2 divisors, whose sum is σ = 31143494. Its totient is φ = 31143492.

The previous prime is 31143491. The next prime is 31143521. The reversal of 31143493 is 39434113.

It is an a-pointer prime, because the next prime (31143521) can be obtained adding 31143493 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30107169 + 1036324 = 5487^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 31143493 - 2¹ = 31143491 is a prime.

Together with 31143491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571746 + 15571747.

It is an arithmetic number, because the mean of its divisors is an integer number (15571747).

Almost surely, 2^31143493 is an apocalyptic number.

It is an amenable number.

31143493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143493 is an equidigital number, since it uses as much as digits as its factorization.

31143493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 28.

The square root of 31143493 is about 5580.6355372843. The cubic root of 31143493 is about 314.6220140713.

The spelling of 31143493 in words is "thirty-one million, one hundred forty-three thousand, four hundred ninety-three".