122387781 has 4 divisors (see below), whose sum is σ = 163183712. Its totient is φ = 81591852.

The previous prime is 122387779. The next prime is 122387789. The reversal of 122387781 is 187783221.

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 not a de Polignac number, because 122387781 - 2¹ = 122387779 is a prime.

It is a super-2 number, since 2×122387781² = 29957537876207922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122387789) 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, 20397961 + ... + 20397966.

It is an arithmetic number, because the mean of its divisors is an integer number (40795928).

Almost surely, 2^122387781 is an apocalyptic number.

It is an amenable number.

122387781 is a deficient number, since it is larger than the sum of its proper divisors (40795931).

122387781 is an equidigital number, since it uses as much as digits as its factorization.

122387781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40795930.

The product of its digits is 37632, while the sum is 39.

The square root of 122387781 is about 11062.9011113722. The cubic root of 122387781 is about 496.4924936673.

The spelling of 122387781 in words is "one hundred twenty-two million, three hundred eighty-seven thousand, seven hundred eighty-one".