642529049 has 4 divisors (see below), whose sum is σ = 642594660. Its totient is φ = 642463440.

The previous prime is 642529039. The next prime is 642529073. The reversal of 642529049 is 940925246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 615040000 + 27489049 = 24800^2 + 5243^2 .

It is a cyclic number.

It is not a de Polignac number, because 642529049 - 2⁸ = 642528793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642528997 and 642529015.

It is not an unprimeable number, because it can be changed into a prime (642529039) 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, 14834 + ... + 38795.

It is an arithmetic number, because the mean of its divisors is an integer number (160648665).

Almost surely, 2^642529049 is an apocalyptic number.

It is an amenable number.

642529049 is a deficient number, since it is larger than the sum of its proper divisors (65611).

642529049 is a wasteful number, since it uses less digits than its factorization.

642529049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65610.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 642529049 is about 25348.1567179943. The cubic root of 642529049 is about 862.9075238363.

The spelling of 642529049 in words is "six hundred forty-two million, five hundred twenty-nine thousand, forty-nine".