31128893 has 2 divisors, whose sum is σ = 31128894. Its totient is φ = 31128892.

The previous prime is 31128871. The next prime is 31128917. The reversal of 31128893 is 39882113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25989604 + 5139289 = 5098^2 + 2267^2 .

It is a cyclic number.

It is not a de Polignac number, because 31128893 - 2⁶ = 31128829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31128193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15564446 + 15564447.

It is an arithmetic number, because the mean of its divisors is an integer number (15564447).

Almost surely, 2^31128893 is an apocalyptic number.

It is an amenable number.

31128893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31128893 is an equidigital number, since it uses as much as digits as its factorization.

31128893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 31128893 is about 5579.3272891989. The cubic root of 31128893 is about 314.5728416872.

The spelling of 31128893 in words is "thirty-one million, one hundred twenty-eight thousand, eight hundred ninety-three".