121761331 has 4 divisors (see below), whose sum is σ = 121836472. Its totient is φ = 121686192.

The previous prime is 121761319. The next prime is 121761403. The reversal of 121761331 is 133167121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133167121 = 47 ⋅2833343.

It is a cyclic number.

It is not a de Polignac number, because 121761331 - 2¹¹ = 121759283 is a prime.

It is a super-2 number, since 2×121761331² = 29651643453783122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121761296 and 121761305.

It is not an unprimeable number, because it can be changed into a prime (121761301) 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, 35085 + ... + 38398.

It is an arithmetic number, because the mean of its divisors is an integer number (30459118).

Almost surely, 2^121761331 is an apocalyptic number.

121761331 is a deficient number, since it is larger than the sum of its proper divisors (75141).

121761331 is an equidigital number, since it uses as much as digits as its factorization.

121761331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75140.

The product of its digits is 756, while the sum is 25.

The square root of 121761331 is about 11034.5516900325. The cubic root of 121761331 is about 495.6439342595.

The spelling of 121761331 in words is "one hundred twenty-one million, seven hundred sixty-one thousand, three hundred thirty-one".