121640683 has 4 divisors (see below), whose sum is σ = 125564608. Its totient is φ = 117716760.

The previous prime is 121640677. The next prime is 121640741. The reversal of 121640683 is 386046121.

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: 386046121 = 1381 ⋅279541.

It is a cyclic number.

It is not a de Polignac number, because 121640683 - 2¹⁷ = 121509611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 3923893 = 121640683 / (1 + 2 + 1 + 6 + 4 + 0 + 6 + 8 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121640633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961916 + ... + 1961977.

It is an arithmetic number, because the mean of its divisors is an integer number (31391152).

Almost surely, 2^121640683 is an apocalyptic number.

121640683 is a deficient number, since it is larger than the sum of its proper divisors (3923925).

121640683 is an equidigital number, since it uses as much as digits as its factorization.

121640683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923924.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 121640683 is about 11029.0835068015. The cubic root of 121640683 is about 495.4801761645.

The spelling of 121640683 in words is "one hundred twenty-one million, six hundred forty thousand, six hundred eighty-three".