80399531 has 4 divisors (see below), whose sum is σ = 81599592. Its totient is φ = 79199472.

The previous prime is 80399521. The next prime is 80399537. The reversal of 80399531 is 13599308.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80399531 is a prime.

It is a super-2 number, since 2×80399531² = 12928169170039922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80399537) 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, 599930 + ... + 600063.

It is an arithmetic number, because the mean of its divisors is an integer number (20399898).

Almost surely, 2^80399531 is an apocalyptic number.

80399531 is a deficient number, since it is larger than the sum of its proper divisors (1200061).

80399531 is a wasteful number, since it uses less digits than its factorization.

80399531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200060.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 80399531 is about 8966.5785559488. The cubic root of 80399531 is about 431.6030500772.

The spelling of 80399531 in words is "eighty million, three hundred ninety-nine thousand, five hundred thirty-one".