642551114 has 4 divisors (see below), whose sum is σ = 963826674. Its totient is φ = 321275556.

The previous prime is 642551113. The next prime is 642551131. The reversal of 642551114 is 411155246.

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

It can be written as a sum of positive squares in only one way, i.e., 363093025 + 279458089 = 19055^2 + 16717^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642551113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160637777 + ... + 160637780.

Almost surely, 2^642551114 is an apocalyptic number.

642551114 is a deficient number, since it is larger than the sum of its proper divisors (321275560).

642551114 is a wasteful number, since it uses less digits than its factorization.

642551114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321275559.

The product of its digits is 4800, while the sum is 29.

The square root of 642551114 is about 25348.5919530060. The cubic root of 642551114 is about 862.9174013853.

The spelling of 642551114 in words is "six hundred forty-two million, five hundred fifty-one thousand, one hundred fourteen".