642896149 has 4 divisors (see below), whose sum is σ = 734738464. Its totient is φ = 551053836.

The previous prime is 642896117. The next prime is 642896153. The reversal of 642896149 is 941698246.

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 642896149 - 2⁵ = 642896117 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 (642816149) 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 in 3 ways as a sum of consecutive naturals, for example, 45921147 + ... + 45921160.

It is an arithmetic number, because the mean of its divisors is an integer number (183684616).

Almost surely, 2^642896149 is an apocalyptic number.

It is an amenable number.

642896149 is a deficient number, since it is larger than the sum of its proper divisors (91842315).

642896149 is an equidigital number, since it uses as much as digits as its factorization.

642896149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91842314.

The product of its digits is 746496, while the sum is 49.

The square root of 642896149 is about 25355.3968416982. The cubic root of 642896149 is about 863.0718292705.

The spelling of 642896149 in words is "six hundred forty-two million, eight hundred ninety-six thousand, one hundred forty-nine".