31475321 has 2 divisors, whose sum is σ = 31475322. Its totient is φ = 31475320.

The previous prime is 31475317. The next prime is 31475341. The reversal of 31475321 is 12357413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 11806096 = 4435^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 31475321 - 2² = 31475317 is a prime.

It is not a weakly prime, because it can be changed into another prime (31475341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15737660 + 15737661.

It is an arithmetic number, because the mean of its divisors is an integer number (15737661).

Almost surely, 2^31475321 is an apocalyptic number.

It is an amenable number.

31475321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31475321 is an equidigital number, since it uses as much as digits as its factorization.

31475321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 31475321 is about 5610.2870693040. The cubic root of 31475321 is about 315.7354813827.

The spelling of 31475321 in words is "thirty-one million, four hundred seventy-five thousand, three hundred twenty-one".