31073532649 has 4 divisors (see below), whose sum is σ = 31375217536. Its totient is φ = 30771847764.

The previous prime is 31073532647. The next prime is 31073532661. The reversal of 31073532649 is 94623537013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94623537013 = 877 ⋅107894569.

It is a cyclic number.

It is not a de Polignac number, because 31073532649 - 2¹ = 31073532647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31073532641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150842289 + ... + 150842494.

It is an arithmetic number, because the mean of its divisors is an integer number (7843804384).

Almost surely, 2^31073532649 is an apocalyptic number.

It is an amenable number.

31073532649 is a deficient number, since it is larger than the sum of its proper divisors (301684887).

31073532649 is a wasteful number, since it uses less digits than its factorization.

31073532649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301684886.

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 31073532649 in words is "thirty-one billion, seventy-three million, five hundred thirty-two thousand, six hundred forty-nine".