121872445 has 8 divisors (see below), whose sum is σ = 147093336. Its totient is φ = 96933696.

The previous prime is 121872437. The next prime is 121872451. The reversal of 121872445 is 544278121.

It can be written as a sum of positive squares in 4 ways, for example, as 67864644 + 54007801 = 8238^2 + 7349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121872445 - 2³ = 121872437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121872445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69582 + ... + 71311.

It is an arithmetic number, because the mean of its divisors is an integer number (18386667).

Almost surely, 2^121872445 is an apocalyptic number.

It is an amenable number.

121872445 is a deficient number, since it is larger than the sum of its proper divisors (25220891).

121872445 is a wasteful number, since it uses less digits than its factorization.

121872445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141071.

The product of its digits is 17920, while the sum is 34.

The square root of 121872445 is about 11039.5853635904. The cubic root of 121872445 is about 495.7946559918.

The spelling of 121872445 in words is "one hundred twenty-one million, eight hundred seventy-two thousand, four hundred forty-five".