81376069 has 4 divisors (see below), whose sum is σ = 85659040. Its totient is φ = 77093100.

The previous prime is 81376067. The next prime is 81376079. The reversal of 81376069 is 96067318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81376069 - 2¹ = 81376067 is a prime.

It is a super-2 number, since 2×81376069² = 13244129211785522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81376063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141457 + ... + 2141494.

It is an arithmetic number, because the mean of its divisors is an integer number (21414760).

Almost surely, 2^81376069 is an apocalyptic number.

It is an amenable number.

81376069 is a deficient number, since it is larger than the sum of its proper divisors (4282971).

81376069 is a wasteful number, since it uses less digits than its factorization.

81376069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282970.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 81376069 is about 9020.8685280299. The cubic root of 81376069 is about 433.3434490078.

The spelling of 81376069 in words is "eighty-one million, three hundred seventy-six thousand, sixty-nine".