81313127 has 16 divisors (see below), whose sum is σ = 95606784. Its totient is φ = 67704000.

The previous prime is 81313117. The next prime is 81313139. The reversal of 81313127 is 72131318.

It is not a de Polignac number, because 81313127 - 2¹² = 81309031 is a prime.

It is a super-2 number, since 2×81313127² = 13223649245036258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81313096 and 81313105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81313117) 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, 88802 + ... + 89712.

It is an arithmetic number, because the mean of its divisors is an integer number (5975424).

Almost surely, 2^81313127 is an apocalyptic number.

81313127 is a deficient number, since it is larger than the sum of its proper divisors (14293657).

81313127 is a wasteful number, since it uses less digits than its factorization.

81313127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its digits is 1008, while the sum is 26.

The square root of 81313127 is about 9017.3791647019. The cubic root of 81313127 is about 433.2316940451.

The spelling of 81313127 in words is "eighty-one million, three hundred thirteen thousand, one hundred twenty-seven".