97999809 has 16 divisors (see below), whose sum is σ = 135022464. Its totient is φ = 63190400.

The previous prime is 97999807. The next prime is 97999813. The reversal of 97999809 is 90899979.

It is a cyclic number.

It is not a de Polignac number, because 97999809 - 2¹ = 97999807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97999807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6949 + ... + 15629.

It is an arithmetic number, because the mean of its divisors is an integer number (8438904).

Almost surely, 2^97999809 is an apocalyptic number.

It is an amenable number.

97999809 is a deficient number, since it is larger than the sum of its proper divisors (37022655).

97999809 is a wasteful number, since it uses less digits than its factorization.

97999809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808.

The product of its (nonzero) digits is 3306744, while the sum is 60.

The square root of 97999809 is about 9899.4852896502. The cubic root of 97999809 is about 461.0433296841.

The spelling of 97999809 in words is "ninety-seven million, nine hundred ninety-nine thousand, eight hundred nine".