649649047 has 4 divisors (see below), whose sum is σ = 655609240. Its totient is φ = 643688856.

The previous prime is 649649029. The next prime is 649649057. The reversal of 649649047 is 740946946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740946946 = 2 ⋅370473473.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649649047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649649017) 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, 2979933 + ... + 2980150.

It is an arithmetic number, because the mean of its divisors is an integer number (163902310).

Almost surely, 2^649649047 is an apocalyptic number.

649649047 is a deficient number, since it is larger than the sum of its proper divisors (5960193).

649649047 is a wasteful number, since it uses less digits than its factorization.

649649047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960192.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 649649047 is about 25488.2138840681. The cubic root of 649649047 is about 866.0831751135.

The spelling of 649649047 in words is "six hundred forty-nine million, six hundred forty-nine thousand, forty-seven".