121787997 has 16 divisors (see below), whose sum is σ = 166932480. Its totient is φ = 78935472.

The previous prime is 121787971. The next prime is 121788001. The reversal of 121787997 is 799787121.

It is a happy number.

It is not a de Polignac number, because 121787997 - 2¹⁸ = 121525853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121787927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27204 + ... + 31362.

It is an arithmetic number, because the mean of its divisors is an integer number (10433280).

Almost surely, 2^121787997 is an apocalyptic number.

It is an amenable number.

121787997 is a deficient number, since it is larger than the sum of its proper divisors (45144483).

121787997 is a wasteful number, since it uses less digits than its factorization.

121787997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432.

The product of its digits is 444528, while the sum is 51.

The square root of 121787997 is about 11035.7599194618. The cubic root of 121787997 is about 495.6801139900.

The spelling of 121787997 in words is "one hundred twenty-one million, seven hundred eighty-seven thousand, nine hundred ninety-seven".