121996783 has 4 divisors (see below), whose sum is σ = 122275120. Its totient is φ = 121718448.

The previous prime is 121996759. The next prime is 121996813. The reversal of 121996783 is 387699121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387699121 = 71 ⋅5460551.

It is a cyclic number.

It is not a de Polignac number, because 121996783 - 2⁹ = 121996271 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 (121996723) 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, 138510 + ... + 139387.

It is an arithmetic number, because the mean of its divisors is an integer number (30568780).

Almost surely, 2^121996783 is an apocalyptic number.

121996783 is a deficient number, since it is larger than the sum of its proper divisors (278337).

121996783 is an equidigital number, since it uses as much as digits as its factorization.

121996783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278336.

The product of its digits is 163296, while the sum is 46.

The square root of 121996783 is about 11045.2153894797. The cubic root of 121996783 is about 495.9632069807.

The spelling of 121996783 in words is "one hundred twenty-one million, nine hundred ninety-six thousand, seven hundred eighty-three".