121780601 has 8 divisors (see below), whose sum is σ = 125309184. Its totient is φ = 118283760.

The previous prime is 121780573. The next prime is 121780609. The reversal of 121780601 is 106087121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121780601 - 2¹⁸ = 121518457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121780609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 15606.

It is an arithmetic number, because the mean of its divisors is an integer number (15663648).

Almost surely, 2^121780601 is an apocalyptic number.

It is an amenable number.

121780601 is a deficient number, since it is larger than the sum of its proper divisors (3528583).

121780601 is a wasteful number, since it uses less digits than its factorization.

121780601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15871.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 121780601 is about 11035.4248219088. The cubic root of 121780601 is about 495.6700798201.

It can be divided in two parts, 1217 and 80601, that added together give a palindrome (81818).

The spelling of 121780601 in words is "one hundred twenty-one million, seven hundred eighty thousand, six hundred one".