31243001 has 2 divisors, whose sum is σ = 31243002. Its totient is φ = 31243000.

The previous prime is 31242979. The next prime is 31243007. The reversal of 31243001 is 10034213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30085225 + 1157776 = 5485^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 31243001 - 2¹⁸ = 30980857 is a prime.

It is a super-2 number, since 2×31243001² = 1952250222972002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31243007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621500 + 15621501.

It is an arithmetic number, because the mean of its divisors is an integer number (15621501).

Almost surely, 2^31243001 is an apocalyptic number.

It is an amenable number.

31243001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31243001 is an equidigital number, since it uses as much as digits as its factorization.

31243001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31243001 is about 5589.5438991030. The cubic root of 31243001 is about 314.9567455515.

Adding to 31243001 its reverse (10034213), we get a palindrome (41277214).

The spelling of 31243001 in words is "thirty-one million, two hundred forty-three thousand, one".