81051419 has 4 divisors (see below), whose sum is σ = 81795120. Its totient is φ = 80307720.

The previous prime is 81051413. The next prime is 81051457. The reversal of 81051419 is 91415018.

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-81051419 is a prime.

It is a super-2 number, since 2×81051419² = 13138665043827122, 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 = 81051391 and 81051400.

It is not an unprimeable number, because it can be changed into a prime (81051413) 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, 371687 + ... + 371904.

It is an arithmetic number, because the mean of its divisors is an integer number (20448780).

Almost surely, 2^81051419 is an apocalyptic number.

81051419 is a deficient number, since it is larger than the sum of its proper divisors (743701).

81051419 is a wasteful number, since it uses less digits than its factorization.

81051419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743700.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 81051419 is about 9002.8561579090. The cubic root of 81051419 is about 432.7664060849.

The spelling of 81051419 in words is "eighty-one million, fifty-one thousand, four hundred nineteen".