121951181 has 6 divisors (see below), whose sum is σ = 134045646. Its totient is φ = 110864600.

The previous prime is 121951169. The next prime is 121951187. The reversal of 121951181 is 181159121.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 4553956 = 10835^2 + 2134^2 .

It is not a de Polignac number, because 121951181 - 2¹⁸ = 121689037 is a prime.

It is a super-2 number, since 2×121951181² = 29744181094589522, 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 (121951187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 503810 + ... + 504051.

It is an arithmetic number, because the mean of its divisors is an integer number (22340941).

Almost surely, 2^121951181 is an apocalyptic number.

121951181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121951181 is a deficient number, since it is larger than the sum of its proper divisors (12094465).

121951181 is a wasteful number, since it uses less digits than its factorization.

121951181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007883 (or 1007872 counting only the distinct ones).

The product of its digits is 720, while the sum is 29.

The square root of 121951181 is about 11043.1508637707. The cubic root of 121951181 is about 495.9014028024.

The spelling of 121951181 in words is "one hundred twenty-one million, nine hundred fifty-one thousand, one hundred eighty-one".