31229797 has 2 divisors, whose sum is σ = 31229798. Its totient is φ = 31229796.

The previous prime is 31229789. The next prime is 31229801. The reversal of 31229797 is 79792213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 6964321 = 4926^2 + 2639^2 .

It is an emirp because it is prime and its reverse (79792213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31229797 - 2³ = 31229789 is a prime.

It is a super-2 number, since 2×31229797² = 1950600441322418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31229707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15614898 + 15614899.

It is an arithmetic number, because the mean of its divisors is an integer number (15614899).

Almost surely, 2^31229797 is an apocalyptic number.

It is an amenable number.

31229797 is a deficient number, since it is larger than the sum of its proper divisors (1).

31229797 is an equidigital number, since it uses as much as digits as its factorization.

31229797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 31229797 is about 5588.3626403447. The cubic root of 31229797 is about 314.9123700143.

The spelling of 31229797 in words is "thirty-one million, two hundred twenty-nine thousand, seven hundred ninety-seven".