121772159 has 12 divisors (see below), whose sum is σ = 131271264. Its totient is φ = 112892832.

The previous prime is 121772149. The next prime is 121772177. The reversal of 121772159 is 951277121.

It is not a de Polignac number, because 121772159 - 2¹² = 121768063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121772149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13379 + ... + 20555.

It is an arithmetic number, because the mean of its divisors is an integer number (10939272).

Almost surely, 2^121772159 is an apocalyptic number.

121772159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121772159 is a deficient number, since it is larger than the sum of its proper divisors (9499105).

121772159 is an equidigital number, since it uses as much as digits as its factorization.

121772159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7262 (or 7243 counting only the distinct ones).

The product of its digits is 8820, while the sum is 35.

The square root of 121772159 is about 11035.0423198101. The cubic root of 121772159 is about 495.6586260432.

The spelling of 121772159 in words is "one hundred twenty-one million, seven hundred seventy-two thousand, one hundred fifty-nine".