31242641 has 2 divisors, whose sum is σ = 31242642. Its totient is φ = 31242640.

The previous prime is 31242623. The next prime is 31242643. The reversal of 31242641 is 14624213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 495616 = 5545^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 31242641 - 2⁶ = 31242577 is a prime.

It is a super-2 number, since 2×31242641² = 1952205233309762, which contains 22 as substring.

Together with 31242643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31242643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621320 + 15621321.

It is an arithmetic number, because the mean of its divisors is an integer number (15621321).

Almost surely, 2^31242641 is an apocalyptic number.

It is an amenable number.

31242641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242641 is an equidigital number, since it uses as much as digits as its factorization.

31242641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 31242641 is about 5589.5116960250. The cubic root of 31242641 is about 314.9555358420.

Adding to 31242641 its reverse (14624213), we get a palindrome (45866854).

The spelling of 31242641 in words is "thirty-one million, two hundred forty-two thousand, six hundred forty-one".