31485893 has 2 divisors, whose sum is σ = 31485894. Its totient is φ = 31485892.

The previous prime is 31485889. The next prime is 31485917. The reversal of 31485893 is 39858413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 11710084 = 4447^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 31485893 - 2² = 31485889 is a prime.

It is a super-2 number, since 2×31485893² = 1982722916014898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31485893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31485803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15742946 + 15742947.

It is an arithmetic number, because the mean of its divisors is an integer number (15742947).

Almost surely, 2^31485893 is an apocalyptic number.

It is an amenable number.

31485893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31485893 is an equidigital number, since it uses as much as digits as its factorization.

31485893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 31485893 is about 5611.2291879766. The cubic root of 31485893 is about 315.7708274015.

The spelling of 31485893 in words is "thirty-one million, four hundred eighty-five thousand, eight hundred ninety-three".