31393073 has 4 divisors (see below), whose sum is σ = 33045360. Its totient is φ = 29740788.

The previous prime is 31393069. The next prime is 31393081. The reversal of 31393073 is 37039313.

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.

It is a cyclic number.

It is not a de Polignac number, because 31393073 - 2² = 31393069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31393093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826115 + ... + 826152.

It is an arithmetic number, because the mean of its divisors is an integer number (8261340).

Almost surely, 2^31393073 is an apocalyptic number.

It is an amenable number.

31393073 is a deficient number, since it is larger than the sum of its proper divisors (1652287).

31393073 is a wasteful number, since it uses less digits than its factorization.

31393073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652286.

The product of its (nonzero) digits is 5103, while the sum is 29.

The square root of 31393073 is about 5602.9521682770. The cubic root of 31393073 is about 315.4602258976.

The spelling of 31393073 in words is "thirty-one million, three hundred ninety-three thousand, seventy-three".