121782149 has 4 divisors (see below), whose sum is σ = 124614336. Its totient is φ = 118949964.

The previous prime is 121782137. The next prime is 121782151. The reversal of 121782149 is 941287121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121782149 - 2⁸ = 121781893 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 (121782109) 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, 1416029 + ... + 1416114.

It is an arithmetic number, because the mean of its divisors is an integer number (31153584).

Almost surely, 2^121782149 is an apocalyptic number.

It is an amenable number.

121782149 is a deficient number, since it is larger than the sum of its proper divisors (2832187).

121782149 is an equidigital number, since it uses as much as digits as its factorization.

121782149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832186.

The product of its digits is 8064, while the sum is 35.

The square root of 121782149 is about 11035.4949594479. The cubic root of 121782149 is about 495.6721800288.

The spelling of 121782149 in words is "one hundred twenty-one million, seven hundred eighty-two thousand, one hundred forty-nine".