121564619 has 4 divisors (see below), whose sum is σ = 132615960. Its totient is φ = 110513280.

The previous prime is 121564589. The next prime is 121564627. The reversal of 121564619 is 916465121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121564619 is a prime.

It is a super-2 number, since 2×121564619² = 29555913185230322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121564699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525654 + ... + 5525675.

It is an arithmetic number, because the mean of its divisors is an integer number (33153990).

Almost surely, 2^121564619 is an apocalyptic number.

121564619 is a deficient number, since it is larger than the sum of its proper divisors (11051341).

121564619 is a wasteful number, since it uses less digits than its factorization.

121564619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051340.

The product of its digits is 12960, while the sum is 35.

The square root of 121564619 is about 11025.6346302605. The cubic root of 121564619 is about 495.3768772198.

The spelling of 121564619 in words is "one hundred twenty-one million, five hundred sixty-four thousand, six hundred nineteen".