81141401 has 16 divisors (see below), whose sum is σ = 93080448. Its totient is φ = 70012800.

The previous prime is 81141397. The next prime is 81141413. The reversal of 81141401 is 10414118.

It is a happy number.

It is not a de Polignac number, because 81141401 - 2² = 81141397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81141421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33491 + ... + 35831.

It is an arithmetic number, because the mean of its divisors is an integer number (5817528).

Almost surely, 2^81141401 is an apocalyptic number.

It is an amenable number.

81141401 is a deficient number, since it is larger than the sum of its proper divisors (11939047).

81141401 is a wasteful number, since it uses less digits than its factorization.

81141401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 81141401 is about 9007.8521857322. The cubic root of 81141401 is about 432.9264969897.

Adding to 81141401 its reverse (10414118), we get a palindrome (91555519).

The spelling of 81141401 in words is "eighty-one million, one hundred forty-one thousand, four hundred one".