123612551 has 2 divisors, whose sum is σ = 123612552. Its totient is φ = 123612550.

The previous prime is 123612527. The next prime is 123612571. The reversal of 123612551 is 155216321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123612551 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123612551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123612571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61806275 + 61806276.

It is an arithmetic number, because the mean of its divisors is an integer number (61806276).

Almost surely, 2^123612551 is an apocalyptic number.

123612551 is a deficient number, since it is larger than the sum of its proper divisors (1).

123612551 is an equidigital number, since it uses as much as digits as its factorization.

123612551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 123612551 is about 11118.1181411244. The cubic root of 123612551 is about 498.1431809821.

Adding to 123612551 its reverse (155216321), we get a palindrome (278828872).

The spelling of 123612551 in words is "one hundred twenty-three million, six hundred twelve thousand, five hundred fifty-one".