31621001 has 2 divisors, whose sum is σ = 31621002. Its totient is φ = 31621000.

The previous prime is 31620973. The next prime is 31621013. The reversal of 31621001 is 10012613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 12924025 = 4324^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 31621001 - 2⁶ = 31620937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31621081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15810500 + 15810501.

It is an arithmetic number, because the mean of its divisors is an integer number (15810501).

Almost surely, 2^31621001 is an apocalyptic number.

It is an amenable number.

31621001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31621001 is an equidigital number, since it uses as much as digits as its factorization.

31621001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 31621001 is about 5623.2553738915. The cubic root of 31621001 is about 316.2218472338.

Adding to 31621001 its reverse (10012613), we get a palindrome (41633614).

The spelling of 31621001 in words is "thirty-one million, six hundred twenty-one thousand, one".