123557081 has 8 divisors (see below), whose sum is σ = 133375680. Its totient is φ = 114109072.

The previous prime is 123557069. The next prime is 123557087. The reversal of 123557081 is 180755321.

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

It is a de Polignac number, because none of the positive numbers 2^k-123557081 is a prime.

It is a super-2 number, since 2×123557081² = 30532704530481122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123557087) 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, 91955 + ... + 93288.

It is an arithmetic number, because the mean of its divisors is an integer number (16671960).

Almost surely, 2^123557081 is an apocalyptic number.

It is an amenable number.

123557081 is a deficient number, since it is larger than the sum of its proper divisors (9818599).

123557081 is a wasteful number, since it uses less digits than its factorization.

123557081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185295.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 123557081 is about 11115.6232843687. The cubic root of 123557081 is about 498.0686574372.

The spelling of 123557081 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, eighty-one".