121635445 has 8 divisors (see below), whose sum is σ = 146025144. Its totient is φ = 97266624.

The previous prime is 121635427. The next prime is 121635457. The reversal of 121635445 is 544536121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49028004 + 72607441 = 7002^2 + 8521^2 .

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 121635445 - 2¹⁹ = 121111157 is a prime.

It is a Duffinian number.

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, 14127 + ... + 21043.

It is an arithmetic number, because the mean of its divisors is an integer number (18253143).

Almost surely, 2^121635445 is an apocalyptic number.

It is an amenable number.

121635445 is a deficient number, since it is larger than the sum of its proper divisors (24389699).

121635445 is an equidigital number, since it uses as much as digits as its factorization.

121635445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439.

The product of its digits is 14400, while the sum is 31.

The square root of 121635445 is about 11028.8460411777. The cubic root of 121635445 is about 495.4730640636.

The spelling of 121635445 in words is "one hundred twenty-one million, six hundred thirty-five thousand, four hundred forty-five".