31478851 has 2 divisors, whose sum is σ = 31478852. Its totient is φ = 31478850.

The previous prime is 31478831. The next prime is 31478911. The reversal of 31478851 is 15887413.

It is a weak prime.

It is an emirp because it is prime and its reverse (15887413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31478851 - 2²¹ = 29381699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31478851.

It is not a weakly prime, because it can be changed into another prime (31478831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15739425 + 15739426.

It is an arithmetic number, because the mean of its divisors is an integer number (15739426).

Almost surely, 2^31478851 is an apocalyptic number.

31478851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31478851 is an equidigital number, since it uses as much as digits as its factorization.

31478851 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 31478851 is about 5610.6016611412. The cubic root of 31478851 is about 315.7472843292.

The spelling of 31478851 in words is "thirty-one million, four hundred seventy-eight thousand, eight hundred fifty-one".