647299137 has 4 divisors (see below), whose sum is σ = 863065520. Its totient is φ = 431532756.

The previous prime is 647299129. The next prime is 647299141. The reversal of 647299137 is 731992746.

It is a happy number.

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.

It is not a de Polignac number, because 647299137 - 2³ = 647299129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647299537) 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, 107883187 + ... + 107883192.

It is an arithmetic number, because the mean of its divisors is an integer number (215766380).

Almost surely, 2^647299137 is an apocalyptic number.

It is an amenable number.

647299137 is a deficient number, since it is larger than the sum of its proper divisors (215766383).

647299137 is a wasteful number, since it uses less digits than its factorization.

647299137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215766382.

The product of its digits is 571536, while the sum is 48.

The square root of 647299137 is about 25442.0741489368. The cubic root of 647299137 is about 865.0376483552.

The spelling of 647299137 in words is "six hundred forty-seven million, two hundred ninety-nine thousand, one hundred thirty-seven".