121401785 has 8 divisors (see below), whose sum is σ = 147319560. Its totient is φ = 96029824.

The previous prime is 121401781. The next prime is 121401793. The reversal of 121401785 is 587104121.

It can be written as a sum of positive squares in 4 ways, for example, as 20178064 + 101223721 = 4492^2 + 10061^2 .

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 121401785 - 2² = 121401781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121401781) 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, 135962 + ... + 136851.

It is an arithmetic number, because the mean of its divisors is an integer number (18414945).

Almost surely, 2^121401785 is an apocalyptic number.

It is an amenable number.

121401785 is a deficient number, since it is larger than the sum of its proper divisors (25917775).

121401785 is an equidigital number, since it uses as much as digits as its factorization.

121401785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272907.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 121401785 is about 11018.2478189592. The cubic root of 121401785 is about 495.1555950680.

The spelling of 121401785 in words is "one hundred twenty-one million, four hundred one thousand, seven hundred eighty-five".