121981797 has 12 divisors (see below), whose sum is σ = 201366880. Its totient is φ = 69703848.

The previous prime is 121981793. The next prime is 121981799. The reversal of 121981797 is 797189121.

It is a happy number.

It is not a de Polignac number, because 121981797 - 2² = 121981793 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 (121981793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 968047 + ... + 968172.

Almost surely, 2^121981797 is an apocalyptic number.

It is an amenable number.

121981797 is a deficient number, since it is larger than the sum of its proper divisors (79385083).

121981797 is a wasteful number, since it uses less digits than its factorization.

121981797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936232 (or 1936229 counting only the distinct ones).

The product of its digits is 63504, while the sum is 45.

The square root of 121981797 is about 11044.5369753557. The cubic root of 121981797 is about 495.9428982240.

The spelling of 121981797 in words is "one hundred twenty-one million, nine hundred eighty-one thousand, seven hundred ninety-seven".