642948053 has 4 divisors (see below), whose sum is σ = 701397888. Its totient is φ = 584498220.

The previous prime is 642948037. The next prime is 642948071. The reversal of 642948053 is 350849246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642948053 - 2⁴ = 642948037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 642948053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642948073) 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, 29224901 + ... + 29224922.

It is an arithmetic number, because the mean of its divisors is an integer number (175349472).

Almost surely, 2^642948053 is an apocalyptic number.

It is an amenable number.

642948053 is a deficient number, since it is larger than the sum of its proper divisors (58449835).

642948053 is a wasteful number, since it uses less digits than its factorization.

642948053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58449834.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 642948053 is about 25356.4203506725. The cubic root of 642948053 is about 863.0950552481.

The spelling of 642948053 in words is "six hundred forty-two million, nine hundred forty-eight thousand, fifty-three".