81201442 has 16 divisors (see below), whose sum is σ = 139711680. Its totient is φ = 34673328.

The previous prime is 81201433. The next prime is 81201467. The reversal of 81201442 is 24410218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6592 + ... + 14347.

It is an arithmetic number, because the mean of its divisors is an integer number (8731980).

Almost surely, 2^81201442 is an apocalyptic number.

81201442 is a deficient number, since it is larger than the sum of its proper divisors (58510238).

81201442 is a wasteful number, since it uses less digits than its factorization.

81201442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 81201442 is about 9011.1842728911. The cubic root of 81201442 is about 433.0332527306.

The spelling of 81201442 in words is "eighty-one million, two hundred one thousand, four hundred forty-two".