1201231985 has 8 divisors (see below), whose sum is σ = 1526271336. Its totient is φ = 904456960.

The previous prime is 1201231979. The next prime is 1201231987. The reversal of 1201231985 is 5891321021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 162588001 + 1038643984 = 12751^2 + 32228^2 .

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

It is not a de Polignac number, because 1201231985 - 2⁸ = 1201231729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201231987) 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, 7065986 + ... + 7066155.

It is an arithmetic number, because the mean of its divisors is an integer number (190783917).

Almost surely, 2^1201231985 is an apocalyptic number.

It is an amenable number.

1201231985 is a deficient number, since it is larger than the sum of its proper divisors (325039351).

1201231985 is a wasteful number, since it uses less digits than its factorization.

1201231985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14132163.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1201231985 is about 34658.7937614684. The cubic root of 1201231985 is about 1063.0221057515.

The spelling of 1201231985 in words is "one billion, two hundred one million, two hundred thirty-one thousand, nine hundred eighty-five".