647091 has 6 divisors (see below), whose sum is σ = 934700. Its totient is φ = 431388.

The previous prime is 647081. The next prime is 647099. The reversal of 647091 is 190746.

It is not a de Polignac number, because 647091 - 2¹⁰ = 646067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35941 + ... + 35958.

2⁶⁴⁷⁰⁹¹ is an apocalyptic number.

647091 is a deficient number, since it is larger than the sum of its proper divisors (287609).

647091 is a wasteful number, since it uses less digits than its factorization.

647091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71905 (or 71902 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 647091 is about 804.4196665920. The cubic root of 647091 is about 86.4944921705.

It can be divided in two parts, 6470 and 91, that added together give a 8-th power (6561 = 3⁸).

The spelling of 647091 in words is "six hundred forty-seven thousand, ninety-one".