127431997 has 18 divisors (see below), whose sum is σ = 162946014. Its totient is φ = 99293040.

The previous prime is 127431991. The next prime is 127432001. The reversal of 127431997 is 799134721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 82555396 + 44876601 = 9086^2 + 6699^2 .

It is not a de Polignac number, because 127431997 - 2⁷ = 127431869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127431991) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4818 + ... + 16675.

Almost surely, 2^127431997 is an apocalyptic number.

It is an amenable number.

127431997 is a deficient number, since it is larger than the sum of its proper divisors (35514017).

127431997 is a wasteful number, since it uses less digits than its factorization.

127431997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21529 (or 21511 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 127431997 is about 11288.5781655619. The cubic root of 127431997 is about 503.2218573451.

The spelling of 127431997 in words is "one hundred twenty-seven million, four hundred thirty-one thousand, nine hundred ninety-seven".