997551121 has 8 divisors (see below), whose sum is σ = 1140772160. Its totient is φ = 854508528.

The previous prime is 997551097. The next prime is 997551127. The reversal of 997551121 is 121155799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997551121 - 2¹¹ = 997549073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997551127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32406 + ... + 55183.

It is an arithmetic number, because the mean of its divisors is an integer number (142596520).

Almost surely, 2^997551121 is an apocalyptic number.

It is an amenable number.

997551121 is a deficient number, since it is larger than the sum of its proper divisors (143221039).

997551121 is a wasteful number, since it uses less digits than its factorization.

997551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89223.

The product of its digits is 28350, while the sum is 40.

The square root of 997551121 is about 31584.0326905859. The cubic root of 997551121 is about 999.1830397577.

The spelling of 997551121 in words is "nine hundred ninety-seven million, five hundred fifty-one thousand, one hundred twenty-one".