121289397 has 8 divisors (see below), whose sum is σ = 167295840. Its totient is φ = 78071280.

The previous prime is 121289383. The next prime is 121289417. The reversal of 121289397 is 793982121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121289397 - 2⁴ = 121289381 is a prime.

It is a super-2 number, since 2×121289397² = 29422235649247218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121289317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696979 + ... + 697152.

It is an arithmetic number, because the mean of its divisors is an integer number (20911980).

Almost surely, 2^121289397 is an apocalyptic number.

It is an amenable number.

121289397 is a deficient number, since it is larger than the sum of its proper divisors (46006443).

121289397 is a wasteful number, since it uses less digits than its factorization.

121289397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394163.

The product of its digits is 54432, while the sum is 42.

The square root of 121289397 is about 11013.1465530973. The cubic root of 121289397 is about 495.0027507244.

It can be divided in two parts, 1212 and 89397, that added together give a palindrome (90609).

The spelling of 121289397 in words is "one hundred twenty-one million, two hundred eighty-nine thousand, three hundred ninety-seven".