31145293 has 2 divisors, whose sum is σ = 31145294. Its totient is φ = 31145292.

The previous prime is 31145227. The next prime is 31145299. The reversal of 31145293 is 39254113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24980004 + 6165289 = 4998^2 + 2483^2 .

It is an emirp because it is prime and its reverse (39254113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31145293 - 2²¹ = 29048141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31145299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572646 + 15572647.

It is an arithmetic number, because the mean of its divisors is an integer number (15572647).

Almost surely, 2^31145293 is an apocalyptic number.

It is an amenable number.

31145293 is a deficient number, since it is larger than the sum of its proper divisors (1).

31145293 is an equidigital number, since it uses as much as digits as its factorization.

31145293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 31145293 is about 5580.7968069085. The cubic root of 31145293 is about 314.6280753558.

The spelling of 31145293 in words is "thirty-one million, one hundred forty-five thousand, two hundred ninety-three".