997611895 has 32 divisors (see below), whose sum is σ = 1401753600. Its totient is φ = 667372416.

The previous prime is 997611893. The next prime is 997611907. The reversal of 997611895 is 598116799.

It is a cyclic number.

It is not a de Polignac number, because 997611895 - 2¹ = 997611893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997611893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 639126 + ... + 640684.

It is an arithmetic number, because the mean of its divisors is an integer number (43804800).

Almost surely, 2^997611895 is an apocalyptic number.

997611895 is a deficient number, since it is larger than the sum of its proper divisors (404141705).

997611895 is a wasteful number, since it uses less digits than its factorization.

997611895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007.

The product of its digits is 1224720, while the sum is 55.

The square root of 997611895 is about 31584.9947760008. The cubic root of 997611895 is about 999.2033304862.

The spelling of 997611895 in words is "nine hundred ninety-seven million, six hundred eleven thousand, eight hundred ninety-five".