1642625123 has 4 divisors (see below), whose sum is σ = 1651136328. Its totient is φ = 1634113920.

The previous prime is 1642625099. The next prime is 1642625129. The reversal of 1642625123 is 3215262461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3215262461 = 181 ⋅17763881.

It is a cyclic number.

It is not a de Polignac number, because 1642625123 - 2²⁸ = 1374189667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642625123.

It is not an unprimeable number, because it can be changed into a prime (1642625129) 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, 4255313 + ... + 4255698.

It is an arithmetic number, because the mean of its divisors is an integer number (412784082).

Almost surely, 2^1642625123 is an apocalyptic number.

1642625123 is a deficient number, since it is larger than the sum of its proper divisors (8511205).

1642625123 is an equidigital number, since it uses as much as digits as its factorization.

1642625123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8511204.

The product of its digits is 17280, while the sum is 32.

The square root of 1642625123 is about 40529.3118989208. The cubic root of 1642625123 is about 1179.9025877165.

Adding to 1642625123 its reverse (3215262461), we get a palindrome (4857887584).

The spelling of 1642625123 in words is "one billion, six hundred forty-two million, six hundred twenty-five thousand, one hundred twenty-three".