123057551 has 4 divisors (see below), whose sum is σ = 123123792. Its totient is φ = 122991312.

The previous prime is 123057503. The next prime is 123057553. The reversal of 123057551 is 155750321.

It is a happy number.

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 123057551 - 2²² = 118863247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123057553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30251 + ... + 34076.

It is an arithmetic number, because the mean of its divisors is an integer number (30780948).

Almost surely, 2^123057551 is an apocalyptic number.

123057551 is a deficient number, since it is larger than the sum of its proper divisors (66241).

123057551 is an equidigital number, since it uses as much as digits as its factorization.

123057551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66240.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 123057551 is about 11093.1308024381. The cubic root of 123057551 is about 497.3965354734.

The spelling of 123057551 in words is "one hundred twenty-three million, fifty-seven thousand, five hundred fifty-one".