121623749 has 8 divisors (see below), whose sum is σ = 131923680. Its totient is φ = 111458736.

The previous prime is 121623713. The next prime is 121623791. The reversal of 121623749 is 947326121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121623749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121623449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31847 + ... + 35460.

It is an arithmetic number, because the mean of its divisors is an integer number (16490460).

Almost surely, 2^121623749 is an apocalyptic number.

It is an amenable number.

121623749 is a deficient number, since it is larger than the sum of its proper divisors (10299931).

121623749 is a wasteful number, since it uses less digits than its factorization.

121623749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67459.

The product of its digits is 18144, while the sum is 35.

The square root of 121623749 is about 11028.3157825663. The cubic root of 121623749 is about 495.4571826218.

The spelling of 121623749 in words is "one hundred twenty-one million, six hundred twenty-three thousand, seven hundred forty-nine".