122881781 has 8 divisors (see below), whose sum is σ = 135355584. Its totient is φ = 110625120.

The previous prime is 122881777. The next prime is 122881789. The reversal of 122881781 is 187188221.

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

It is a cyclic number.

It is not a de Polignac number, because 122881781 - 2² = 122881777 is a prime.

It is a super-2 number, since 2×122881781² = 30199864203463922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122881789) 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, 53096 + ... + 55361.

It is an arithmetic number, because the mean of its divisors is an integer number (16919448).

Almost surely, 2^122881781 is an apocalyptic number.

122881781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122881781 is a deficient number, since it is larger than the sum of its proper divisors (12473803).

122881781 is a wasteful number, since it uses less digits than its factorization.

122881781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108571.

The product of its digits is 14336, while the sum is 38.

The square root of 122881781 is about 11085.2055010270. The cubic root of 122881781 is about 497.1596028425.

The spelling of 122881781 in words is "one hundred twenty-two million, eight hundred eighty-one thousand, seven hundred eighty-one".