121489649 has 4 divisors (see below), whose sum is σ = 121764336. Its totient is φ = 121214964.

The previous prime is 121489639. The next prime is 121489679. The reversal of 121489649 is 946984121.

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 a de Polignac number, because none of the positive numbers 2^k-121489649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121489639) 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, 136679 + ... + 137564.

It is an arithmetic number, because the mean of its divisors is an integer number (30441084).

Almost surely, 2^121489649 is an apocalyptic number.

It is an amenable number.

121489649 is a deficient number, since it is larger than the sum of its proper divisors (274687).

121489649 is an equidigital number, since it uses as much as digits as its factorization.

121489649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274686.

The product of its digits is 124416, while the sum is 44.

The square root of 121489649 is about 11022.2343016287. The cubic root of 121489649 is about 495.2750218117.

The spelling of 121489649 in words is "one hundred twenty-one million, four hundred eighty-nine thousand, six hundred forty-nine".