121661245 has 8 divisors (see below), whose sum is σ = 148468320. Its totient is φ = 95679120.

The previous prime is 121661219. The next prime is 121661251. The reversal of 121661245 is 542166121.

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

It is not a de Polignac number, because 121661245 - 2⁷ = 121661117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205911 + ... + 206500.

It is an arithmetic number, because the mean of its divisors is an integer number (18558540).

Almost surely, 2^121661245 is an apocalyptic number.

It is an amenable number.

121661245 is a deficient number, since it is larger than the sum of its proper divisors (26807075).

121661245 is an equidigital number, since it uses as much as digits as its factorization.

121661245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412475.

The product of its digits is 2880, while the sum is 28.

The square root of 121661245 is about 11030.0156391548. The cubic root of 121661245 is about 495.5080930563.

The spelling of 121661245 in words is "one hundred twenty-one million, six hundred sixty-one thousand, two hundred forty-five".