997549143 has 16 divisors (see below), whose sum is σ = 1346268000. Its totient is φ = 656968320.

The previous prime is 997549127. The next prime is 997549177. The reversal of 997549143 is 341945799.

It is not a de Polignac number, because 997549143 - 2⁴ = 997549127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997549243) 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, 109753 + ... + 118493.

It is an arithmetic number, because the mean of its divisors is an integer number (84141750).

Almost surely, 2^997549143 is an apocalyptic number.

997549143 is a deficient number, since it is larger than the sum of its proper divisors (348718857).

997549143 is a wasteful number, since it uses less digits than its factorization.

997549143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202.

The product of its digits is 1224720, while the sum is 51.

The square root of 997549143 is about 31584.0013772796. The cubic root of 997549143 is about 999.1823793453.

The spelling of 997549143 in words is "nine hundred ninety-seven million, five hundred forty-nine thousand, one hundred forty-three".