31415887 has 2 divisors, whose sum is σ = 31415888. Its totient is φ = 31415886.

The previous prime is 31415869. The next prime is 31415893. The reversal of 31415887 is 78851413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31415887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31415837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15707943 + 15707944.

It is an arithmetic number, because the mean of its divisors is an integer number (15707944).

Almost surely, 2^31415887 is an apocalyptic number.

31415887 is a deficient number, since it is larger than the sum of its proper divisors (1).

31415887 is an equidigital number, since it uses as much as digits as its factorization.

31415887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 31415887 is about 5604.9876895494. The cubic root of 31415887 is about 315.5366245660.

The spelling of 31415887 in words is "thirty-one million, four hundred fifteen thousand, eight hundred eighty-seven".