127997513 has 4 divisors (see below), whose sum is σ = 146282880. Its totient is φ = 109712148.

The previous prime is 127997479. The next prime is 127997521. The reversal of 127997513 is 315799721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315799721 = 47 ⋅6719143.

It is not a de Polignac number, because 127997513 - 2¹⁸ = 127735369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127907513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9142673 + ... + 9142686.

It is an arithmetic number, because the mean of its divisors is an integer number (36570720).

Almost surely, 2^127997513 is an apocalyptic number.

It is an amenable number.

127997513 is a deficient number, since it is larger than the sum of its proper divisors (18285367).

127997513 is an equidigital number, since it uses as much as digits as its factorization.

127997513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18285366.

The product of its digits is 119070, while the sum is 44.

The square root of 127997513 is about 11313.5985875406. The cubic root of 127997513 is about 503.9651559538.

The spelling of 127997513 in words is "one hundred twenty-seven million, nine hundred ninety-seven thousand, five hundred thirteen".