642850249 has 4 divisors (see below), whose sum is σ = 644422420. Its totient is φ = 641278080.

The previous prime is 642850217. The next prime is 642850261. The reversal of 642850249 is 942058246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 269124025 + 373726224 = 16405^2 + 19332^2 .

It is a cyclic number.

It is not a de Polignac number, because 642850249 - 2⁵ = 642850217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642850289) 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, 785472 + ... + 786289.

It is an arithmetic number, because the mean of its divisors is an integer number (161105605).

Almost surely, 2^642850249 is an apocalyptic number.

It is an amenable number.

642850249 is a deficient number, since it is larger than the sum of its proper divisors (1572171).

642850249 is a wasteful number, since it uses less digits than its factorization.

642850249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572170.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 642850249 is about 25354.4916927948. The cubic root of 642850249 is about 863.0512889184.

The spelling of 642850249 in words is "six hundred forty-two million, eight hundred fifty thousand, two hundred forty-nine".