997251929 has 2 divisors, whose sum is σ = 997251930. Its totient is φ = 997251928.

The previous prime is 997251847. The next prime is 997251947. The reversal of 997251929 is 929152799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 374499904 = 24955^2 + 19352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997251929 is a prime.

It is a super-2 number, since 2×997251929² = 1989022819788442082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (997251529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498625964 + 498625965.

It is an arithmetic number, because the mean of its divisors is an integer number (498625965).

Almost surely, 2^997251929 is an apocalyptic number.

It is an amenable number.

997251929 is a deficient number, since it is larger than the sum of its proper divisors (1).

997251929 is an equidigital number, since it uses as much as digits as its factorization.

997251929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 53.

The square root of 997251929 is about 31579.2958914539. The cubic root of 997251929 is about 999.0831359506.

The spelling of 997251929 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, nine hundred twenty-nine".