121878497 has 4 divisors (see below), whose sum is σ = 131253780. Its totient is φ = 112503216.

The previous prime is 121878487. The next prime is 121878509. The reversal of 121878497 is 794878121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51251281 + 70627216 = 7159^2 + 8404^2 .

It is a cyclic number.

It is not a de Polignac number, because 121878497 - 2⁶ = 121878433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121878487) 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, 4687622 + ... + 4687647.

It is an arithmetic number, because the mean of its divisors is an integer number (32813445).

Almost surely, 2^121878497 is an apocalyptic number.

It is an amenable number.

121878497 is a deficient number, since it is larger than the sum of its proper divisors (9375283).

121878497 is an equidigital number, since it uses as much as digits as its factorization.

121878497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375282.

The product of its digits is 225792, while the sum is 47.

The square root of 121878497 is about 11039.8594646852. The cubic root of 121878497 is about 495.8028626584.

The spelling of 121878497 in words is "one hundred twenty-one million, eight hundred seventy-eight thousand, four hundred ninety-seven".