81583142 has 8 divisors (see below), whose sum is σ = 123924000. Its totient is φ = 40275144.

The previous prime is 81583141. The next prime is 81583157. The reversal of 81583142 is 24138518.

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

It is a junction number, because it is equal to n+sod(n) for n = 81583099 and 81583108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81583141) 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, 258017 + ... + 258332.

It is an arithmetic number, because the mean of its divisors is an integer number (15490500).

Almost surely, 2^81583142 is an apocalyptic number.

81583142 is a deficient number, since it is larger than the sum of its proper divisors (42340858).

81583142 is a wasteful number, since it uses less digits than its factorization.

81583142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516430.

The product of its digits is 7680, while the sum is 32.

The square root of 81583142 is about 9032.3386783269. The cubic root of 81583142 is about 433.7107057174.

The spelling of 81583142 in words is "eighty-one million, five hundred eighty-three thousand, one hundred forty-two".