123551551 has 8 divisors (see below), whose sum is σ = 127118384. Its totient is φ = 120035520.

The previous prime is 123551543. The next prime is 123551557. The reversal of 123551551 is 155155321.

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

It is a cyclic number.

It is not a de Polignac number, because 123551551 - 2³ = 123551543 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 (123551557) 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, 7740 + ... + 17521.

It is an arithmetic number, because the mean of its divisors is an integer number (15889798).

Almost surely, 2^123551551 is an apocalyptic number.

123551551 is a deficient number, since it is larger than the sum of its proper divisors (3566833).

123551551 is an equidigital number, since it uses as much as digits as its factorization.

123551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25401.

The product of its digits is 3750, while the sum is 28.

The square root of 123551551 is about 11115.3745326012. The cubic root of 123551551 is about 498.0612266996.

The spelling of 123551551 in words is "one hundred twenty-three million, five hundred fifty-one thousand, five hundred fifty-one".