31489949 has 2 divisors, whose sum is σ = 31489950. Its totient is φ = 31489948.

The previous prime is 31489943. The next prime is 31489963. The reversal of 31489949 is 94998413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 964324 = 5525^2 + 982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31489949 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 (31489943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15744974 + 15744975.

It is an arithmetic number, because the mean of its divisors is an integer number (15744975).

Almost surely, 2^31489949 is an apocalyptic number.

It is an amenable number.

31489949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31489949 is an equidigital number, since it uses as much as digits as its factorization.

31489949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 31489949 is about 5611.5905944750. The cubic root of 31489949 is about 315.7843859760.

The spelling of 31489949 in words is "thirty-one million, four hundred eighty-nine thousand, nine hundred forty-nine".