997444421 has 2 divisors, whose sum is σ = 997444422. Its totient is φ = 997444420.

The previous prime is 997444397. The next prime is 997444453. The reversal of 997444421 is 124444799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991368196 + 6076225 = 31486^2 + 2465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997444421 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997044421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498722210 + 498722211.

It is an arithmetic number, because the mean of its divisors is an integer number (498722211).

Almost surely, 2^997444421 is an apocalyptic number.

It is an amenable number.

997444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

997444421 is an equidigital number, since it uses as much as digits as its factorization.

997444421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 997444421 is about 31582.3435007600. The cubic root of 997444421 is about 999.1474136364.

The spelling of 997444421 in words is "nine hundred ninety-seven million, four hundred forty-four thousand, four hundred twenty-one".