799031981 has 4 divisors (see below), whose sum is σ = 871671264. Its totient is φ = 726392700.

The previous prime is 799031963. The next prime is 799031993. The reversal of 799031981 is 189130997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 799031981 - 2⁶ = 799031917 is a prime.

It is a super-2 number, since 2×799031981² = 1276904213321568722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799031081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36319625 + ... + 36319646.

It is an arithmetic number, because the mean of its divisors is an integer number (217917816).

Almost surely, 2^799031981 is an apocalyptic number.

It is an amenable number.

799031981 is a deficient number, since it is larger than the sum of its proper divisors (72639283).

799031981 is a wasteful number, since it uses less digits than its factorization.

799031981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72639282.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 799031981 is about 28267.1537477688. The cubic root of 799031981 is about 927.9431867499.

The spelling of 799031981 in words is "seven hundred ninety-nine million, thirty-one thousand, nine hundred eighty-one".