642123411 has 8 divisors (see below), whose sum is σ = 901225920. Its totient is φ = 405551592.

The previous prime is 642123401. The next prime is 642123421. The reversal of 642123411 is 114321246.

It is an interprime number because it is at equal distance from previous prime (642123401) and next prime (642123421).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642123411 - 2⁵ = 642123379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642123401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5632605 + ... + 5632718.

It is an arithmetic number, because the mean of its divisors is an integer number (112653240).

Almost surely, 2^642123411 is an apocalyptic number.

642123411 is a deficient number, since it is larger than the sum of its proper divisors (259102509).

642123411 is a wasteful number, since it uses less digits than its factorization.

642123411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11265345.

The product of its digits is 1152, while the sum is 24.

The square root of 642123411 is about 25340.1541234461. The cubic root of 642123411 is about 862.7258968900.

Adding to 642123411 its reverse (114321246), we get a palindrome (756444657).

The spelling of 642123411 in words is "six hundred forty-two million, one hundred twenty-three thousand, four hundred eleven".