31677649 has 2 divisors, whose sum is σ = 31677650. Its totient is φ = 31677648.

The previous prime is 31677643. The next prime is 31677673. The reversal of 31677649 is 94677613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 986049 = 5540^2 + 993^2 .

It is an emirp because it is prime and its reverse (94677613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31677649 - 2⁷ = 31677521 is a prime.

It is not a weakly prime, because it can be changed into another prime (31677643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15838824 + 15838825.

It is an arithmetic number, because the mean of its divisors is an integer number (15838825).

Almost surely, 2^31677649 is an apocalyptic number.

It is an amenable number.

31677649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31677649 is an equidigital number, since it uses as much as digits as its factorization.

31677649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 31677649 is about 5628.2900600449. The cubic root of 31677649 is about 316.4105683180.

It can be divided in two parts, 3167 and 7649, that added together give a square (10816 = 104²).

The spelling of 31677649 in words is "thirty-one million, six hundred seventy-seven thousand, six hundred forty-nine".