121663549 has 4 divisors (see below), whose sum is σ = 139044064. Its totient is φ = 104283036.

The previous prime is 121663547. The next prime is 121663559. The reversal of 121663549 is 945366121.

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 121663549 - 2¹ = 121663547 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 (121663547) 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, 8690247 + ... + 8690260.

It is an arithmetic number, because the mean of its divisors is an integer number (34761016).

Almost surely, 2^121663549 is an apocalyptic number.

It is an amenable number.

121663549 is a deficient number, since it is larger than the sum of its proper divisors (17380515).

121663549 is an equidigital number, since it uses as much as digits as its factorization.

121663549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17380514.

The product of its digits is 38880, while the sum is 37.

The square root of 121663549 is about 11030.1200809420. The cubic root of 121663549 is about 495.5112209860.

It can be divided in two parts, 12166 and 3549, that multiplied together give a palindrome (43177134).

The spelling of 121663549 in words is "one hundred twenty-one million, six hundred sixty-three thousand, five hundred forty-nine".