997999001 has 2 divisors, whose sum is σ = 997999002. Its totient is φ = 997999000.

The previous prime is 997998973. The next prime is 997999007. The reversal of 997999001 is 100999799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870309001 + 127690000 = 29501^2 + 11300^2 .

It is a cyclic number.

It is not a de Polignac number, because 997999001 - 2¹⁴ = 997982617 is a prime.

It is not a weakly prime, because it can be changed into another prime (997999007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498999500 + 498999501.

It is an arithmetic number, because the mean of its divisors is an integer number (498999501).

Almost surely, 2^997999001 is an apocalyptic number.

It is an amenable number.

997999001 is a deficient number, since it is larger than the sum of its proper divisors (1).

997999001 is an equidigital number, since it uses as much as digits as its factorization.

997999001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 997999001 is about 31591.1221864624. The cubic root of 997999001 is about 999.3325549495.

The spelling of 997999001 in words is "nine hundred ninety-seven million, nine hundred ninety-nine thousand, one".