31363649 has 2 divisors, whose sum is σ = 31363650. Its totient is φ = 31363648.

The previous prime is 31363621. The next prime is 31363667. The reversal of 31363649 is 94636313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 283024 = 5575^2 + 532^2 .

It is an emirp because it is prime and its reverse (94636313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31363649 - 2¹² = 31359553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31363609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15681824 + 15681825.

It is an arithmetic number, because the mean of its divisors is an integer number (15681825).

Almost surely, 2^31363649 is an apocalyptic number.

It is an amenable number.

31363649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31363649 is an equidigital number, since it uses as much as digits as its factorization.

31363649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 35.

The square root of 31363649 is about 5600.3257940945. The cubic root of 31363649 is about 315.3616372359.

The spelling of 31363649 in words is "thirty-one million, three hundred sixty-three thousand, six hundred forty-nine".