31525397 has 2 divisors, whose sum is σ = 31525398. Its totient is φ = 31525396.

The previous prime is 31525379. The next prime is 31525421. The reversal of 31525397 is 79352513.

It is a happy number.

Together with previous prime (31525379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31460881 + 64516 = 5609^2 + 254^2 .

It is an emirp because it is prime and its reverse (79352513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31525397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31525367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15762698 + 15762699.

It is an arithmetic number, because the mean of its divisors is an integer number (15762699).

Almost surely, 2^31525397 is an apocalyptic number.

It is an amenable number.

31525397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31525397 is an equidigital number, since it uses as much as digits as its factorization.

31525397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 35.

The square root of 31525397 is about 5614.7481688852. The cubic root of 31525397 is about 315.9028335822.

The spelling of 31525397 in words is "thirty-one million, five hundred twenty-five thousand, three hundred ninety-seven".