81003031 has 8 divisors (see below), whose sum is σ = 84230784. Its totient is φ = 77813760.

The previous prime is 81003029. The next prime is 81003053. The reversal of 81003031 is 13030018.

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

It is a cyclic number.

It is not a de Polignac number, because 81003031 - 2¹ = 81003029 is a prime.

It is a super-2 number, since 2×81003031² = 13122982062373922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81002996 and 81003014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81003001) 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, 5290 + ... + 13783.

It is an arithmetic number, because the mean of its divisors is an integer number (10528848).

Almost surely, 2^81003031 is an apocalyptic number.

81003031 is a deficient number, since it is larger than the sum of its proper divisors (3227753).

81003031 is a wasteful number, since it uses less digits than its factorization.

81003031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19241.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 81003031 is about 9000.1683873137. The cubic root of 81003031 is about 432.6802678872.

Adding to 81003031 its reverse (13030018), we get a palindrome (94033049).

The spelling of 81003031 in words is "eighty-one million, three thousand, thirty-one".