81151077 has 16 divisors (see below), whose sum is σ = 127923840. Its totient is φ = 44772672.

The previous prime is 81151069. The next prime is 81151079. The reversal of 81151077 is 77015118.

It is a happy number.

It is not a de Polignac number, because 81151077 - 2³ = 81151069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151079) 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, 66018 + ... + 67235.

It is an arithmetic number, because the mean of its divisors is an integer number (7995240).

Almost surely, 2^81151077 is an apocalyptic number.

81151077 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

81151077 is a deficient number, since it is larger than the sum of its proper divisors (46772763).

81151077 is a wasteful number, since it uses less digits than its factorization.

81151077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133292.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 81151077 is about 9008.3892566873. The cubic root of 81151077 is about 432.9437049346.

The spelling of 81151077 in words is "eighty-one million, one hundred fifty-one thousand, seventy-seven".