31469989 has 2 divisors, whose sum is σ = 31469990. Its totient is φ = 31469988.

The previous prime is 31469987. The next prime is 31470013. The reversal of 31469989 is 98996413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 667489 = 5550^2 + 817^2 .

It is an emirp because it is prime and its reverse (98996413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31469989 - 2¹ = 31469987 is a prime.

Together with 31469987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31469987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15734994 + 15734995.

It is an arithmetic number, because the mean of its divisors is an integer number (15734995).

Almost surely, 2^31469989 is an apocalyptic number.

It is an amenable number.

31469989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31469989 is an equidigital number, since it uses as much as digits as its factorization.

31469989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 31469989 is about 5609.8118506773. The cubic root of 31469989 is about 315.7176515761.

The spelling of 31469989 in words is "thirty-one million, four hundred sixty-nine thousand, nine hundred eighty-nine".