121505147 has 2 divisors, whose sum is σ = 121505148. Its totient is φ = 121505146.

The previous prime is 121505141. The next prime is 121505161. The reversal of 121505147 is 741505121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121505147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121505141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60752573 + 60752574.

It is an arithmetic number, because the mean of its divisors is an integer number (60752574).

Almost surely, 2^121505147 is an apocalyptic number.

121505147 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505147 is an equidigital number, since it uses as much as digits as its factorization.

121505147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 121505147 is about 11022.9373127130. The cubic root of 121505147 is about 495.2960810706.

Subtracting from 121505147 its sum of digits (26), we obtain a palindrome (121505121).

The spelling of 121505147 in words is "one hundred twenty-one million, five hundred five thousand, one hundred forty-seven".