31113541 has 2 divisors, whose sum is σ = 31113542. Its totient is φ = 31113540.

The previous prime is 31113539. The next prime is 31113557. The reversal of 31113541 is 14531113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28037025 + 3076516 = 5295^2 + 1754^2 .

It is an emirp because it is prime and its reverse (14531113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31113541 - 2¹ = 31113539 is a prime.

It is a super-3 number, since 3×31113541³ (a number of 23 digits) contains 333 as substring.

Together with 31113539, 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 (31113521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556770 + 15556771.

It is an arithmetic number, because the mean of its divisors is an integer number (15556771).

Almost surely, 2^31113541 is an apocalyptic number.

It is an amenable number.

31113541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113541 is an equidigital number, since it uses as much as digits as its factorization.

31113541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 31113541 is about 5577.9513264280. The cubic root of 31113541 is about 314.5211200024.

Adding to 31113541 its reverse (14531113), we get a palindrome (45644654).

The spelling of 31113541 in words is "thirty-one million, one hundred thirteen thousand, five hundred forty-one".