949999981 has 16 divisors (see below), whose sum is σ = 1192550400. Its totient is φ = 737885808.

The previous prime is 949999961. The next prime is 949999993. The reversal of 949999981 is 189999949.

It is a cyclic number.

It is not a de Polignac number, because 949999981 - 2⁹ = 949999469 is a prime.

It is a super-2 number, since 2×949999981² = 1804999927800000722, 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 (949999961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152221 + ... + 158338.

It is an arithmetic number, because the mean of its divisors is an integer number (74534400).

Almost surely, 2^949999981 is an apocalyptic number.

It is an amenable number.

949999981 is a deficient number, since it is larger than the sum of its proper divisors (242550419).

949999981 is a wasteful number, since it uses less digits than its factorization.

949999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310608.

The product of its digits is 17006112, while the sum is 67.

The square root of 949999981 is about 30822.0697066242. The cubic root of 949999981 is about 983.0475659379.

The spelling of 949999981 in words is "nine hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".