118644551 has 2 divisors, whose sum is σ = 118644552. Its totient is φ = 118644550.

The previous prime is 118644527. The next prime is 118644563. The reversal of 118644551 is 155446811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118644551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118644521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59322275 + 59322276.

It is an arithmetic number, because the mean of its divisors is an integer number (59322276).

Almost surely, 2^118644551 is an apocalyptic number.

118644551 is a deficient number, since it is larger than the sum of its proper divisors (1).

118644551 is an equidigital number, since it uses as much as digits as its factorization.

118644551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 118644551 is about 10892.4079523308. The cubic root of 118644551 is about 491.3782534990.

The spelling of 118644551 in words is "one hundred eighteen million, six hundred forty-four thousand, five hundred fifty-one".