642536311 has 4 divisors (see below), whose sum is σ = 643236400. Its totient is φ = 641836224.

The previous prime is 642536299. The next prime is 642536329. The reversal of 642536311 is 113635246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113635246 = 2 ⋅56817623.

It is a cyclic number.

It is not a de Polignac number, because 642536311 - 2¹³ = 642528119 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 (642536371) 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, 348666 + ... + 350503.

It is an arithmetic number, because the mean of its divisors is an integer number (160809100).

Almost surely, 2^642536311 is an apocalyptic number.

642536311 is a deficient number, since it is larger than the sum of its proper divisors (700089).

642536311 is an equidigital number, since it uses as much as digits as its factorization.

642536311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700088.

The product of its digits is 12960, while the sum is 31.

The square root of 642536311 is about 25348.2999627194. The cubic root of 642536311 is about 862.9107747455.

The spelling of 642536311 in words is "six hundred forty-two million, five hundred thirty-six thousand, three hundred eleven".