31321417 has 4 divisors (see below), whose sum is σ = 32085396. Its totient is φ = 30557440.

The previous prime is 31321399. The next prime is 31321427. The reversal of 31321417 is 71412313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 24890121 = 2536^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321417 - 2⁷ = 31321289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321427) 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, 381928 + ... + 382009.

It is an arithmetic number, because the mean of its divisors is an integer number (8021349).

Almost surely, 2^31321417 is an apocalyptic number.

It is an amenable number.

31321417 is a deficient number, since it is larger than the sum of its proper divisors (763979).

31321417 is an equidigital number, since it uses as much as digits as its factorization.

31321417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763978.

The product of its digits is 504, while the sum is 22.

The square root of 31321417 is about 5596.5540290432. The cubic root of 31321417 is about 315.2200260033.

The spelling of 31321417 in words is "thirty-one million, three hundred twenty-one thousand, four hundred seventeen".