120978861 has 4 divisors (see below), whose sum is σ = 161305152. Its totient is φ = 80652572.

The previous prime is 120978859. The next prime is 120978877. The reversal of 120978861 is 168879021.

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 120978861 - 2¹ = 120978859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120978841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20163141 + ... + 20163146.

It is an arithmetic number, because the mean of its divisors is an integer number (40326288).

Almost surely, 2^120978861 is an apocalyptic number.

It is an amenable number.

120978861 is a deficient number, since it is larger than the sum of its proper divisors (40326291).

120978861 is an equidigital number, since it uses as much as digits as its factorization.

120978861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40326290.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 120978861 is about 10999.0390943937. The cubic root of 120978861 is about 494.5799395227.

The spelling of 120978861 in words is "one hundred twenty million, nine hundred seventy-eight thousand, eight hundred sixty-one".