122151491 has 16 divisors (see below), whose sum is σ = 152679168. Its totient is φ = 94941600.

The previous prime is 122151481. The next prime is 122151493. The reversal of 122151491 is 194151221.

It is a cyclic number.

It is not a de Polignac number, because 122151491 - 2¹⁰ = 122150467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122151491.

It is not an unprimeable number, because it can be changed into a prime (122151493) 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, 32321 + ... + 35901.

It is an arithmetic number, because the mean of its divisors is an integer number (9542448).

Almost surely, 2^122151491 is an apocalyptic number.

122151491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

122151491 is a deficient number, since it is larger than the sum of its proper divisors (30527677).

122151491 is a wasteful number, since it uses less digits than its factorization.

122151491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042.

The product of its digits is 720, while the sum is 26.

The square root of 122151491 is about 11052.2165650154. The cubic root of 122151491 is about 496.1727673271.

The spelling of 122151491 in words is "one hundred twenty-two million, one hundred fifty-one thousand, four hundred ninety-one".