121154047 has 4 divisors (see below), whose sum is σ = 138461776. Its totient is φ = 103846320.

The previous prime is 121153999. The next prime is 121154071. The reversal of 121154047 is 740451121.

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

It is a cyclic number.

It is not a de Polignac number, because 121154047 - 2²³ = 112765439 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 (121154347) 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, 8653854 + ... + 8653867.

It is an arithmetic number, because the mean of its divisors is an integer number (34615444).

Almost surely, 2^121154047 is an apocalyptic number.

121154047 is a deficient number, since it is larger than the sum of its proper divisors (17307729).

121154047 is an equidigital number, since it uses as much as digits as its factorization.

121154047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17307728.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 121154047 is about 11006.9999091487. Note that the first 4 decimals coincide. The cubic root of 121154047 is about 494.8185533660.

The spelling of 121154047 in words is "one hundred twenty-one million, one hundred fifty-four thousand, forty-seven".