997753891 has 2 divisors, whose sum is σ = 997753892. Its totient is φ = 997753890.

The previous prime is 997753871. The next prime is 997753907. The reversal of 997753891 is 198357799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997753891 - 2²⁵ = 964199459 is a prime.

It is not a weakly prime, because it can be changed into another prime (997753831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498876945 + 498876946.

It is an arithmetic number, because the mean of its divisors is an integer number (498876946).

Almost surely, 2^997753891 is an apocalyptic number.

997753891 is a deficient number, since it is larger than the sum of its proper divisors (1).

997753891 is an equidigital number, since it uses as much as digits as its factorization.

997753891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 58.

The square root of 997753891 is about 31587.2425355554. The cubic root of 997753891 is about 999.2507357433.

The spelling of 997753891 in words is "nine hundred ninety-seven million, seven hundred fifty-three thousand, eight hundred ninety-one".