121308997 has 4 divisors (see below), whose sum is σ = 123597900. Its totient is φ = 119020096.

The previous prime is 121308989. The next prime is 121309009. The reversal of 121308997 is 799803121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100020001 + 21288996 = 10001^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 121308997 - 2³ = 121308989 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 (121308937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1144372 + ... + 1144477.

It is an arithmetic number, because the mean of its divisors is an integer number (30899475).

Almost surely, 2^121308997 is an apocalyptic number.

It is an amenable number.

121308997 is a deficient number, since it is larger than the sum of its proper divisors (2288903).

121308997 is an equidigital number, since it uses as much as digits as its factorization.

121308997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288902.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 121308997 is about 11014.0363627509. The cubic root of 121308997 is about 495.0294129378.

The spelling of 121308997 in words is "one hundred twenty-one million, three hundred eight thousand, nine hundred ninety-seven".