31355413 has 2 divisors, whose sum is σ = 31355414. Its totient is φ = 31355412.

The previous prime is 31355407. The next prime is 31355431. The reversal of 31355413 is 31455313.

Together with next prime (31355431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22071204 + 9284209 = 4698^2 + 3047^2 .

It is an emirp because it is prime and its reverse (31455313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31355413 - 2¹⁷ = 31224341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31355713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15677706 + 15677707.

It is an arithmetic number, because the mean of its divisors is an integer number (15677707).

Almost surely, 2^31355413 is an apocalyptic number.

It is an amenable number.

31355413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31355413 is an equidigital number, since it uses as much as digits as its factorization.

31355413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 31355413 is about 5599.5904314512. The cubic root of 31355413 is about 315.3340304798.

The spelling of 31355413 in words is "thirty-one million, three hundred fifty-five thousand, four hundred thirteen".