81012613 has 8 divisors (see below), whose sum is σ = 88890336. Its totient is φ = 73220400.

The previous prime is 81012611. The next prime is 81012619. The reversal of 81012613 is 31621018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81012613 - 2¹ = 81012611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81012611) 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, 19383 + ... + 23188.

It is an arithmetic number, because the mean of its divisors is an integer number (11111292).

Almost surely, 2^81012613 is an apocalyptic number.

It is an amenable number.

81012613 is a deficient number, since it is larger than the sum of its proper divisors (7877723).

81012613 is a wasteful number, since it uses less digits than its factorization.

81012613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42755.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 81012613 is about 9000.7006949459. The cubic root of 81012613 is about 432.6973280672.

The spelling of 81012613 in words is "eighty-one million, twelve thousand, six hundred thirteen".