647701342531 has 4 divisors (see below), whose sum is σ = 647816209200. Its totient is φ = 647586475864.

The previous prime is 647701342529. The next prime is 647701342543. The reversal of 647701342531 is 135243107746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647701342531 - 2¹ = 647701342529 is a prime.

It is a super-2 number, since 2×647701342531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647701342501) 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, 57424876 + ... + 57436153.

It is an arithmetic number, because the mean of its divisors is an integer number (161954052300).

Almost surely, 2^647701342531 is an apocalyptic number.

647701342531 is a deficient number, since it is larger than the sum of its proper divisors (114866669).

647701342531 is a wasteful number, since it uses less digits than its factorization.

647701342531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114866668.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 647701342531 in words is "six hundred forty-seven billion, seven hundred one million, three hundred forty-two thousand, five hundred thirty-one".