122129491 has 16 divisors (see below), whose sum is σ = 137991168. Its totient is φ = 107085600.

The previous prime is 122129461. The next prime is 122129519. The reversal of 122129491 is 194921221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 122129491 - 2¹³ = 122121299 is a prime.

It is a super-2 number, since 2×122129491² = 29831225143838162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (122129461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189616 + ... + 190258.

It is an arithmetic number, because the mean of its divisors is an integer number (8624448).

Almost surely, 2^122129491 is an apocalyptic number.

122129491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

122129491 is a deficient number, since it is larger than the sum of its proper divisors (15861677).

122129491 is a wasteful number, since it uses less digits than its factorization.

122129491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242.

The product of its digits is 2592, while the sum is 31.

The square root of 122129491 is about 11051.2212447313. The cubic root of 122129491 is about 496.1429779342.

The spelling of 122129491 in words is "one hundred twenty-two million, one hundred twenty-nine thousand, four hundred ninety-one".