122159981 has 4 divisors (see below), whose sum is σ = 123631872. Its totient is φ = 120688092.

The previous prime is 122159963. The next prime is 122159993. The reversal of 122159981 is 189951221.

It is a happy number.

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 not a de Polignac number, because 122159981 - 2¹⁴ = 122143597 is a prime.

It is a super-2 number, since 2×122159981² = 29846121915840722, 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 (122159381) 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, 735821 + ... + 735986.

It is an arithmetic number, because the mean of its divisors is an integer number (30907968).

Almost surely, 2^122159981 is an apocalyptic number.

It is an amenable number.

122159981 is a deficient number, since it is larger than the sum of its proper divisors (1471891).

122159981 is an equidigital number, since it uses as much as digits as its factorization.

122159981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471890.

The product of its digits is 12960, while the sum is 38.

The square root of 122159981 is about 11052.6006441923. The cubic root of 122159981 is about 496.1842623681.

The spelling of 122159981 in words is "one hundred twenty-two million, one hundred fifty-nine thousand, nine hundred eighty-one".