121775249 has 4 divisors (see below), whose sum is σ = 121799220. Its totient is φ = 121751280.

The previous prime is 121775243. The next prime is 121775281. The reversal of 121775249 is 942577121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942577121 = 17 ⋅55445713.

It can be written as a sum of positive squares in 2 ways, for example, as 56731024 + 65044225 = 7532^2 + 8065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121775249 is a prime.

It is a super-2 number, since 2×121775249² = 29658422538024002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121775243) 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, 1022 + ... + 15639.

It is an arithmetic number, because the mean of its divisors is an integer number (30449805).

Almost surely, 2^121775249 is an apocalyptic number.

It is an amenable number.

121775249 is a deficient number, since it is larger than the sum of its proper divisors (23971).

121775249 is an equidigital number, since it uses as much as digits as its factorization.

121775249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23970.

The product of its digits is 35280, while the sum is 38.

The square root of 121775249 is about 11035.1823274471. The cubic root of 121775249 is about 495.6628184963.

The spelling of 121775249 in words is "one hundred twenty-one million, seven hundred seventy-five thousand, two hundred forty-nine".