121361861 has 16 divisors (see below), whose sum is σ = 130916736. Its totient is φ = 112098816.

The previous prime is 121361837. The next prime is 121361893. The reversal of 121361861 is 168163121.

It is a de Polignac number, because none of the positive numbers 2^k-121361861 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 (121361831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248960 + ... + 249446.

It is an arithmetic number, because the mean of its divisors is an integer number (8182296).

Almost surely, 2^121361861 is an apocalyptic number.

It is an amenable number.

121361861 is a deficient number, since it is larger than the sum of its proper divisors (9554875).

121361861 is a wasteful number, since it uses less digits than its factorization.

121361861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its digits is 1728, while the sum is 29.

The square root of 121361861 is about 11016.4359481640. The cubic root of 121361861 is about 495.1013104203.

The spelling of 121361861 in words is "one hundred twenty-one million, three hundred sixty-one thousand, eight hundred sixty-one".