1201944815 has 32 divisors (see below), whose sum is σ = 1528074240. Its totient is φ = 906401664.

The previous prime is 1201944811. The next prime is 1201944841. The reversal of 1201944815 is 5184491021.

It is a cyclic number.

It is not a de Polignac number, because 1201944815 - 2² = 1201944811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201944811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1105202 + ... + 1106288.

It is an arithmetic number, because the mean of its divisors is an integer number (47752320).

Almost surely, 2^1201944815 is an apocalyptic number.

1201944815 is a deficient number, since it is larger than the sum of its proper divisors (326129425).

1201944815 is a wasteful number, since it uses less digits than its factorization.

1201944815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1201944815 is about 34669.0757736632. The cubic root of 1201944815 is about 1063.2323355319.

The spelling of 1201944815 in words is "one billion, two hundred one million, nine hundred forty-four thousand, eight hundred fifteen".