1201918085 has 4 divisors (see below), whose sum is σ = 1442301708. Its totient is φ = 961534464.

The previous prime is 1201918031. The next prime is 1201918097. The reversal of 1201918085 is 5808191021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 840652036 + 361266049 = 28994^2 + 19007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201918085 - 2¹⁶ = 1201852549 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 3 ways as a sum of consecutive naturals, for example, 120191804 + ... + 120191813.

It is an arithmetic number, because the mean of its divisors is an integer number (360575427).

Almost surely, 2^1201918085 is an apocalyptic number.

It is an amenable number.

1201918085 is a deficient number, since it is larger than the sum of its proper divisors (240383623).

1201918085 is an equidigital number, since it uses as much as digits as its factorization.

1201918085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240383622.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 1201918085 is about 34668.6902694636. The cubic root of 1201918085 is about 1063.2244537471.

The spelling of 1201918085 in words is "one billion, two hundred one million, nine hundred eighteen thousand, eighty-five".