120199981 has 8 divisors (see below), whose sum is σ = 131209344. Its totient is φ = 109204320.

The previous prime is 120199957. The next prime is 120199993. The reversal of 120199981 is 189991021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120199981 is a prime.

It is a super-2 number, since 2×120199981² = 28896070864800722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120199901) 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, 25825 + ... + 30121.

It is an arithmetic number, because the mean of its divisors is an integer number (16401168).

Almost surely, 2^120199981 is an apocalyptic number.

120199981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120199981 is a deficient number, since it is larger than the sum of its proper divisors (11009363).

120199981 is a wasteful number, since it uses less digits than its factorization.

120199981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 120199981 is about 10963.5751924270. The cubic root of 120199981 is about 493.5162603320.

The spelling of 120199981 in words is "one hundred twenty million, one hundred ninety-nine thousand, nine hundred eighty-one".