121571953 has 4 divisors (see below), whose sum is σ = 122938020. Its totient is φ = 120205888.

The previous prime is 121571941. The next prime is 121571959. The reversal of 121571953 is 359175121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31169889 + 90402064 = 5583^2 + 9508^2 .

It is a cyclic number.

It is not a de Polignac number, because 121571953 - 2⁵ = 121571921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121571959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682900 + ... + 683077.

It is an arithmetic number, because the mean of its divisors is an integer number (30734505).

Almost surely, 2^121571953 is an apocalyptic number.

It is an amenable number.

121571953 is a deficient number, since it is larger than the sum of its proper divisors (1366067).

121571953 is an equidigital number, since it uses as much as digits as its factorization.

121571953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366066.

The product of its digits is 9450, while the sum is 34.

The square root of 121571953 is about 11025.9672138094. The cubic root of 121571953 is about 495.3868390574.

The spelling of 121571953 in words is "one hundred twenty-one million, five hundred seventy-one thousand, nine hundred fifty-three".