642041431 has 4 divisors (see below), whose sum is σ = 679808592. Its totient is φ = 604274272.

The previous prime is 642041429. The next prime is 642041443. The reversal of 642041431 is 134140246.

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

It is a cyclic number.

It is not a de Polignac number, because 642041431 - 2¹ = 642041429 is a prime.

It is a super-2 number, since 2×642041431² = 824434398241055522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642041396 and 642041405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642041401) 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, 18883555 + ... + 18883588.

It is an arithmetic number, because the mean of its divisors is an integer number (169952148).

Almost surely, 2^642041431 is an apocalyptic number.

642041431 is a deficient number, since it is larger than the sum of its proper divisors (37767161).

642041431 is a wasteful number, since it uses less digits than its factorization.

642041431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37767160.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 642041431 is about 25338.5364810204. The cubic root of 642041431 is about 862.6891805423.

Adding to 642041431 its reverse (134140246), we get a palindrome (776181677).

The spelling of 642041431 in words is "six hundred forty-two million, forty-one thousand, four hundred thirty-one".