121530997 has 4 divisors (see below), whose sum is σ = 138892576. Its totient is φ = 104169420.

The previous prime is 121530979. The next prime is 121531001. The reversal of 121530997 is 799035121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121530997 - 2¹⁵ = 121498229 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 (121530907) 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 3 ways as a sum of consecutive naturals, for example, 8680779 + ... + 8680792.

It is an arithmetic number, because the mean of its divisors is an integer number (34723144).

Almost surely, 2^121530997 is an apocalyptic number.

It is an amenable number.

121530997 is a deficient number, since it is larger than the sum of its proper divisors (17361579).

121530997 is an equidigital number, since it uses as much as digits as its factorization.

121530997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17361578.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 121530997 is about 11024.1098053312. The cubic root of 121530997 is about 495.3312030282.

The spelling of 121530997 in words is "one hundred twenty-one million, five hundred thirty thousand, nine hundred ninety-seven".