121495905 has 24 divisors (see below), whose sum is σ = 212465448. Its totient is φ = 64221696.

The previous prime is 121495897. The next prime is 121495909. The reversal of 121495905 is 509594121.

121495905 is a `hidden beast` number, since 1 + 21 + 49 + 590 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7177041 + 114318864 = 2679^2 + 10692^2 .

It is not a de Polignac number, because 121495905 - 2³ = 121495897 is a prime.

It is a super-2 number, since 2×121495905² = 29522509863538050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121495905.

It is not an unprimeable number, because it can be changed into a prime (121495909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6862 + ... + 17031.

It is an arithmetic number, because the mean of its divisors is an integer number (8852727).

Almost surely, 2^121495905 is an apocalyptic number.

121495905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121495905 is a deficient number, since it is larger than the sum of its proper divisors (90969543).

121495905 is a wasteful number, since it uses less digits than its factorization.

121495905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24017 (or 24014 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 121495905 is about 11022.5180879870. The cubic root of 121495905 is about 495.2835229128.

The spelling of 121495905 in words is "one hundred twenty-one million, four hundred ninety-five thousand, nine hundred five".