31368649 has 16 divisors (see below), whose sum is σ = 34891920. Its totient is φ = 28016640.

The previous prime is 31368647. The next prime is 31368653. The reversal of 31368649 is 94686313.

It can be written as a sum of positive squares in 8 ways, for example, as 399424 + 30969225 = 632^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 31368649 - 2¹ = 31368647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31368641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121929 + ... + 122185.

It is an arithmetic number, because the mean of its divisors is an integer number (2180745).

Almost surely, 2^31368649 is an apocalyptic number.

It is an amenable number.

31368649 is a deficient number, since it is larger than the sum of its proper divisors (3523271).

31368649 is a wasteful number, since it uses less digits than its factorization.

31368649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its digits is 93312, while the sum is 40.

The square root of 31368649 is about 5600.7721789053. The cubic root of 31368649 is about 315.3783946866.

It can be divided in two parts, 3136 and 8649, that multiplied together give a square (27123264 = 5208²).

The spelling of 31368649 in words is "thirty-one million, three hundred sixty-eight thousand, six hundred forty-nine".