121678497 has 8 divisors (see below), whose sum is σ = 180264480. Its totient is φ = 81118980.

The previous prime is 121678493. The next prime is 121678507. The reversal of 121678497 is 794876121.

It is a happy number.

It is not a de Polignac number, because 121678497 - 2² = 121678493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121678493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2253279 + ... + 2253332.

It is an arithmetic number, because the mean of its divisors is an integer number (22533060).

Almost surely, 2^121678497 is an apocalyptic number.

It is an amenable number.

121678497 is a deficient number, since it is larger than the sum of its proper divisors (58585983).

121678497 is an equidigital number, since it uses as much as digits as its factorization.

121678497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506620 (or 4506614 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 121678497 is about 11030.7976592810. The cubic root of 121678497 is about 495.5315135564.

The spelling of 121678497 in words is "one hundred twenty-one million, six hundred seventy-eight thousand, four hundred ninety-seven".