997618136 has 8 divisors (see below), whose sum is σ = 1870534020. Its totient is φ = 498809064.

The previous prime is 997618133. The next prime is 997618163. The reversal of 997618136 is 631816799.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×997618136² = 1990483890552228992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997618133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62351126 + ... + 62351141.

Almost surely, 2^997618136 is an apocalyptic number.

It is an amenable number.

997618136 is a deficient number, since it is larger than the sum of its proper divisors (872915884).

997618136 is a wasteful number, since it uses less digits than its factorization.

997618136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124702273 (or 124702269 counting only the distinct ones).

The product of its digits is 489888, while the sum is 50.

The square root of 997618136 is about 31585.0935727599. The cubic root of 997618136 is about 999.2054141339.

The spelling of 997618136 in words is "nine hundred ninety-seven million, six hundred eighteen thousand, one hundred thirty-six".