81549087 has 8 divisors (see below), whose sum is σ = 109748736. Its totient is φ = 53857752.

The previous prime is 81549067. The next prime is 81549107. The reversal of 81549087 is 78094518.

It is an interprime number because it is at equal distance from previous prime (81549067) and next prime (81549107).

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

It is not a de Polignac number, because 81549087 - 2¹⁵ = 81516319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81549037) 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, 126703 + ... + 127344.

It is an arithmetic number, because the mean of its divisors is an integer number (13718592).

Almost surely, 2^81549087 is an apocalyptic number.

81549087 is a deficient number, since it is larger than the sum of its proper divisors (28199649).

81549087 is a wasteful number, since it uses less digits than its factorization.

81549087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254157.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 81549087 is about 9030.4533108809. The cubic root of 81549087 is about 433.6503498099.

The spelling of 81549087 in words is "eighty-one million, five hundred forty-nine thousand, eighty-seven".