31374397 has 2 divisors, whose sum is σ = 31374398. Its totient is φ = 31374396.

The previous prime is 31374379. The next prime is 31374407. The reversal of 31374397 is 79347313.

Together with previous prime (31374379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 14243076 = 4139^2 + 3774^2 .

It is a cyclic number.

It is not a de Polignac number, because 31374397 - 2¹⁹ = 30850109 is a prime.

It is a super-2 number, since 2×31374397² = 1968705574227218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31374347) 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, 15687198 + 15687199.

It is an arithmetic number, because the mean of its divisors is an integer number (15687199).

Almost surely, 2^31374397 is an apocalyptic number.

It is an amenable number.

31374397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31374397 is an equidigital number, since it uses as much as digits as its factorization.

31374397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 37.

The square root of 31374397 is about 5601.2852989292. The cubic root of 31374397 is about 315.3976568518.

The spelling of 31374397 in words is "thirty-one million, three hundred seventy-four thousand, three hundred ninety-seven".