997121500 has 48 divisors (see below), whose sum is σ = 2252839680. Its totient is φ = 385089600.

The previous prime is 997121449. The next prime is 997121513. The reversal of 997121500 is 5121799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19884 + ... + 48883.

It is an arithmetic number, because the mean of its divisors is an integer number (46934160).

Almost surely, 2^997121500 is an apocalyptic number.

It is an amenable number.

997121500 is an abundant number, since it is smaller than the sum of its proper divisors (1255718180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997121500 is a wasteful number, since it uses less digits than its factorization.

997121500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68815 (or 68803 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 997121500 is about 31577.2307208849. The cubic root of 997121500 is about 999.0395778847.

The spelling of 997121500 in words is "nine hundred ninety-seven million, one hundred twenty-one thousand, five hundred".