81400001 has 8 divisors (see below), whose sum is σ = 82337640. Its totient is φ = 80466048.

The previous prime is 81399979. The next prime is 81400003. The reversal of 81400001 is 10000418.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3519376 + 77880625 = 1876^2 + 8825^2 .

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 81400001 - 2⁶ = 81399937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81400003) 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, 86405 + ... + 87341.

It is an arithmetic number, because the mean of its divisors is an integer number (10292205).

Almost surely, 2^81400001 is an apocalyptic number.

It is an amenable number.

81400001 is a deficient number, since it is larger than the sum of its proper divisors (937639).

81400001 is a wasteful number, since it uses less digits than its factorization.

81400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 81400001 is about 9022.1949103309. The cubic root of 81400001 is about 433.3859257009.

Adding to 81400001 its reverse (10000418), we get a palindrome (91400419).

The spelling of 81400001 in words is "eighty-one million, four hundred thousand, one".