997591207 has 8 divisors (see below), whose sum is σ = 1019286000. Its totient is φ = 976096704.

The previous prime is 997591201. The next prime is 997591249. The reversal of 997591207 is 702195799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997591207 - 2¹⁵ = 997558439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997591201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39982 + ... + 59947.

It is an arithmetic number, because the mean of its divisors is an integer number (127410750).

Almost surely, 2^997591207 is an apocalyptic number.

997591207 is a deficient number, since it is larger than the sum of its proper divisors (21694793).

997591207 is a wasteful number, since it uses less digits than its factorization.

997591207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100145.

The product of its (nonzero) digits is 357210, while the sum is 49.

The square root of 997591207 is about 31584.6672770191. The cubic root of 997591207 is about 999.1964234377.

The spelling of 997591207 in words is "nine hundred ninety-seven million, five hundred ninety-one thousand, two hundred seven".