121979506649 has 32 divisors (see below), whose sum is σ = 173410626816. Its totient is φ = 82576465920.

The previous prime is 121979506631. The next prime is 121979506667. The reversal of 121979506649 is 946605979121.

It is an interprime number because it is at equal distance from previous prime (121979506631) and next prime (121979506667).

It is not a de Polignac number, because 121979506649 - 2⁸ = 121979506393 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121979506609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3567032 + ... + 3601065.

It is an arithmetic number, because the mean of its divisors is an integer number (5419082088).

Almost surely, 2^121979506649 is an apocalyptic number.

It is an amenable number.

121979506649 is a deficient number, since it is larger than the sum of its proper divisors (51431120167).

121979506649 is a wasteful number, since it uses less digits than its factorization.

121979506649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7168145.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 121979506649 in words is "one hundred twenty-one billion, nine hundred seventy-nine million, five hundred six thousand, six hundred forty-nine".