81227013 has 16 divisors (see below), whose sum is σ = 124669440. Its totient is φ = 46079856.

The previous prime is 81226979. The next prime is 81227021. The reversal of 81227013 is 31072218.

It is not a de Polignac number, because 81227013 - 2⁶ = 81226949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227093) 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, 10995 + ... + 16832.

It is an arithmetic number, because the mean of its divisors is an integer number (7791840).

Almost surely, 2^81227013 is an apocalyptic number.

It is an amenable number.

81227013 is a deficient number, since it is larger than the sum of its proper divisors (43442427).

81227013 is a wasteful number, since it uses less digits than its factorization.

81227013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27976.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81227013 is about 9012.6030091201. The cubic root of 81227013 is about 433.0787032008.

The spelling of 81227013 in words is "eighty-one million, two hundred twenty-seven thousand, thirteen".