121782947 has 16 divisors (see below), whose sum is σ = 146946912. Its totient is φ = 99429120.

The previous prime is 121782943. The next prime is 121782961. The reversal of 121782947 is 749287121.

It is a cyclic number.

It is not a de Polignac number, because 121782947 - 2² = 121782943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121782943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6218 + ... + 16799.

It is an arithmetic number, because the mean of its divisors is an integer number (9184182).

Almost surely, 2^121782947 is an apocalyptic number.

121782947 is a deficient number, since it is larger than the sum of its proper divisors (25163965).

121782947 is a wasteful number, since it uses less digits than its factorization.

121782947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23078.

The product of its digits is 56448, while the sum is 41.

The square root of 121782947 is about 11035.5311154470. The cubic root of 121782947 is about 495.6732626876.

The spelling of 121782947 in words is "one hundred twenty-one million, seven hundred eighty-two thousand, nine hundred forty-seven".