81151741 has 8 divisors (see below), whose sum is σ = 89313984. Its totient is φ = 73120320.

The previous prime is 81151739. The next prime is 81151747. The reversal of 81151741 is 14715118.

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 81151741 - 2¹ = 81151739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151747) 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, 31401 + ... + 33886.

It is an arithmetic number, because the mean of its divisors is an integer number (11164248).

Almost surely, 2^81151741 is an apocalyptic number.

It is an amenable number.

81151741 is a deficient number, since it is larger than the sum of its proper divisors (8162243).

81151741 is a wasteful number, since it uses less digits than its factorization.

81151741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65411.

The product of its digits is 1120, while the sum is 28.

The square root of 81151741 is about 9008.4261111473. The cubic root of 81151741 is about 432.9448857521.

Adding to 81151741 its reverse (14715118), we get a palindrome (95866859).

The spelling of 81151741 in words is "eighty-one million, one hundred fifty-one thousand, seven hundred forty-one".