997901099 has 4 divisors (see below), whose sum is σ = 1074662736. Its totient is φ = 921139464.

The previous prime is 997901081. The next prime is 997901111. The reversal of 997901099 is 990109799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990109799 = 7 ⋅141444257.

It is a cyclic number.

It is not a de Polignac number, because 997901099 - 2¹⁶ = 997835563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997901099.

It is not an unprimeable number, because it can be changed into a prime (997901029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38380799 + ... + 38380824.

It is an arithmetic number, because the mean of its divisors is an integer number (268665684).

Almost surely, 2^997901099 is an apocalyptic number.

997901099 is a deficient number, since it is larger than the sum of its proper divisors (76761637).

997901099 is a wasteful number, since it uses less digits than its factorization.

997901099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76761636.

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

The square root of 997901099 is about 31589.5726308540. The cubic root of 997901099 is about 999.2998762745.

The spelling of 997901099 in words is "nine hundred ninety-seven million, nine hundred one thousand, ninety-nine".