123920651 has 4 divisors (see below), whose sum is σ = 123953232. Its totient is φ = 123888072.

The previous prime is 123920627. The next prime is 123920669. The reversal of 123920651 is 156029321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156029321 = 7 ⋅22289903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123920651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123920611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9695 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (30988308).

Almost surely, 2^123920651 is an apocalyptic number.

123920651 is a deficient number, since it is larger than the sum of its proper divisors (32581).

123920651 is an equidigital number, since it uses as much as digits as its factorization.

123920651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32580.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 123920651 is about 11131.9652802189. The cubic root of 123920651 is about 498.5567058125.

Adding to 123920651 its reverse (156029321), we get a palindrome (279949972).

The spelling of 123920651 in words is "one hundred twenty-three million, nine hundred twenty thousand, six hundred fifty-one".