123521454251 has 8 divisors (see below), whose sum is σ = 133810225920. Its totient is φ = 114019801896.

The previous prime is 123521454241. The next prime is 123521454257. The reversal of 123521454251 is 152454125321.

It is not a de Polignac number, because 123521454251 - 2²² = 123517259947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123521454257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28109195 + ... + 28113588.

It is an arithmetic number, because the mean of its divisors is an integer number (16726278240).

Almost surely, 2^123521454251 is an apocalyptic number.

123521454251 is a deficient number, since it is larger than the sum of its proper divisors (10288771669).

123521454251 is an frugal number, since it uses more digits than its factorization.

123521454251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56222822 (or 56222796 counting only the distinct ones).

The product of its digits is 48000, while the sum is 35.

Adding to 123521454251 its reverse (152454125321), we get a palindrome (275975579572).

The spelling of 123521454251 in words is "one hundred twenty-three billion, five hundred twenty-one million, four hundred fifty-four thousand, two hundred fifty-one".