81454031 has 4 divisors (see below), whose sum is σ = 81531864. Its totient is φ = 81376200.

The previous prime is 81454027. The next prime is 81454033. The reversal of 81454031 is 13045418.

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

It is a cyclic number.

It is not a de Polignac number, because 81454031 - 2² = 81454027 is a prime.

It is a super-2 number, since 2×81454031² = 13269518332297922, 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 (81454033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37325 + ... + 39446.

It is an arithmetic number, because the mean of its divisors is an integer number (20382966).

Almost surely, 2^81454031 is an apocalyptic number.

81454031 is a deficient number, since it is larger than the sum of its proper divisors (77833).

81454031 is a wasteful number, since it uses less digits than its factorization.

81454031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77832.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81454031 is about 9025.1886960883. The cubic root of 81454031 is about 433.4817924592.

Adding to 81454031 its reverse (13045418), we get a palindrome (94499449).

It can be divided in two parts, 814 and 54031, that added together give a palindrome (54845).

The spelling of 81454031 in words is "eighty-one million, four hundred fifty-four thousand, thirty-one".