30099981 has 16 divisors (see below), whose sum is σ = 41385344. Its totient is φ = 19445184.

The previous prime is 30099967. The next prime is 30099983. The reversal of 30099981 is 18999003.

It is not a de Polignac number, because 30099981 - 2⁶ = 30099917 is a prime.

It is a super-2 number, since 2×30099981² = 1812017712400722, 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 (30099983) 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, 41040 + ... + 41766.

It is an arithmetic number, because the mean of its divisors is an integer number (2586584).

Almost surely, 2^30099981 is an apocalyptic number.

It is an amenable number.

30099981 is a deficient number, since it is larger than the sum of its proper divisors (11285363).

30099981 is a wasteful number, since it uses less digits than its factorization.

30099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 30099981 is about 5486.3449581666. The cubic root of 30099981 is about 311.0680502997.

The spelling of 30099981 in words is "thirty million, ninety-nine thousand, nine hundred eighty-one".