123557611 has 2 divisors, whose sum is σ = 123557612. Its totient is φ = 123557610.

The previous prime is 123557597. The next prime is 123557617. The reversal of 123557611 is 116755321.

It is a strong prime.

It is an emirp because it is prime and its reverse (116755321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123557611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123557617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61778805 + 61778806.

It is an arithmetic number, because the mean of its divisors is an integer number (61778806).

Almost surely, 2^123557611 is an apocalyptic number.

123557611 is a deficient number, since it is larger than the sum of its proper divisors (1).

123557611 is an equidigital number, since it uses as much as digits as its factorization.

123557611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300, while the sum is 31.

The square root of 123557611 is about 11115.6471246617. The cubic root of 123557611 is about 498.0693695939.

The spelling of 123557611 in words is "one hundred twenty-three million, five hundred fifty-seven thousand, six hundred eleven".