122791813 has 4 divisors (see below), whose sum is σ = 129254560. Its totient is φ = 116329068.

The previous prime is 122791793. The next prime is 122791847. The reversal of 122791813 is 318197221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122791813 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 (122791853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3231345 + ... + 3231382.

It is an arithmetic number, because the mean of its divisors is an integer number (32313640).

Almost surely, 2^122791813 is an apocalyptic number.

It is an amenable number.

122791813 is a deficient number, since it is larger than the sum of its proper divisors (6462747).

122791813 is an equidigital number, since it uses as much as digits as its factorization.

122791813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462746.

The product of its digits is 6048, while the sum is 34.

The square root of 122791813 is about 11081.1467366875. The cubic root of 122791813 is about 497.0382412780.

The spelling of 122791813 in words is "one hundred twenty-two million, seven hundred ninety-one thousand, eight hundred thirteen".