1201199981 has 16 divisors (see below), whose sum is σ = 1262822400. Its totient is φ = 1141058688.

The previous prime is 1201199963. The next prime is 1201200029. The reversal of 1201199981 is 1899911021.

It is a cyclic number.

It is not a de Polignac number, because 1201199981 - 2⁶ = 1201199917 is a prime.

It is a super-2 number, since 2×1201199981² = 2885762788708800722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201199921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574520 + ... + 576606.

It is an arithmetic number, because the mean of its divisors is an integer number (78926400).

Almost surely, 2^1201199981 is an apocalyptic number.

It is an amenable number.

1201199981 is a deficient number, since it is larger than the sum of its proper divisors (61622419).

1201199981 is a wasteful number, since it uses less digits than its factorization.

1201199981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428.

The product of its (nonzero) digits is 11664, while the sum is 41.

The square root of 1201199981 is about 34658.3320573856. The cubic root of 1201199981 is about 1063.0126650933.

The spelling of 1201199981 in words is "one billion, two hundred one million, one hundred ninety-nine thousand, nine hundred eighty-one".