642989413 has 4 divisors (see below), whose sum is σ = 701443008. Its totient is φ = 584535820.

The previous prime is 642989411. The next prime is 642989423. The reversal of 642989413 is 314989246.

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 not a de Polignac number, because 642989413 - 2¹ = 642989411 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 (642989411) 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, 29226781 + ... + 29226802.

It is an arithmetic number, because the mean of its divisors is an integer number (175360752).

Almost surely, 2^642989413 is an apocalyptic number.

It is an amenable number.

642989413 is a deficient number, since it is larger than the sum of its proper divisors (58453595).

642989413 is a wasteful number, since it uses less digits than its factorization.

642989413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58453594.

The product of its digits is 373248, while the sum is 46.

The square root of 642989413 is about 25357.2359100908. The cubic root of 642989413 is about 863.1135621067.

The spelling of 642989413 in words is "six hundred forty-two million, nine hundred eighty-nine thousand, four hundred thirteen".