81313401 has 16 divisors (see below), whose sum is σ = 117684224. Its totient is φ = 49641984.

The previous prime is 81313391. The next prime is 81313417. The reversal of 81313401 is 10431318.

It is not a de Polignac number, because 81313401 - 2⁷ = 81313273 is a prime.

It is a super-2 number, since 2×81313401² = 13223738364373602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81313481) 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, 3256 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (7355264).

Almost surely, 2^81313401 is an apocalyptic number.

It is an amenable number.

81313401 is a deficient number, since it is larger than the sum of its proper divisors (36370823).

81313401 is a wasteful number, since it uses less digits than its factorization.

81313401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16560.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 81313401 is about 9017.3943575736. The cubic root of 81313401 is about 433.2321806634.

Adding to 81313401 its reverse (10431318), we get a palindrome (91744719).

The spelling of 81313401 in words is "eighty-one million, three hundred thirteen thousand, four hundred one".