121151997 has 8 divisors (see below), whose sum is σ = 179484480. Its totient is φ = 80767980.

The previous prime is 121151993. The next prime is 121152019. The reversal of 121151997 is 799151121.

It is not a de Polignac number, because 121151997 - 2² = 121151993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121151993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2243529 + ... + 2243582.

It is an arithmetic number, because the mean of its divisors is an integer number (22435560).

Almost surely, 2^121151997 is an apocalyptic number.

It is an amenable number.

121151997 is a deficient number, since it is larger than the sum of its proper divisors (58332483).

121151997 is an equidigital number, since it uses as much as digits as its factorization.

121151997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487120 (or 4487114 counting only the distinct ones).

The product of its digits is 5670, while the sum is 36.

The square root of 121151997 is about 11006.9067861957. The cubic root of 121151997 is about 494.8157624735.

The spelling of 121151997 in words is "one hundred twenty-one million, one hundred fifty-one thousand, nine hundred ninety-seven".