31121269 has 2 divisors, whose sum is σ = 31121270. Its totient is φ = 31121268.

The previous prime is 31121267. The next prime is 31121273. The reversal of 31121269 is 96212113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29844369 + 1276900 = 5463^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121269 - 2¹ = 31121267 is a prime.

It is a super-2 number, since 2×31121269² = 1937066768340722, which contains 22 as substring.

Together with 31121267, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560634 + 15560635.

It is an arithmetic number, because the mean of its divisors is an integer number (15560635).

Almost surely, 2^31121269 is an apocalyptic number.

It is an amenable number.

31121269 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121269 is an equidigital number, since it uses as much as digits as its factorization.

31121269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 31121269 is about 5578.6440108686. The cubic root of 31121269 is about 314.5471581616.

The spelling of 31121269 in words is "thirty-one million, one hundred twenty-one thousand, two hundred sixty-nine".