81018232151 has 8 divisors (see below), whose sum is σ = 81277174944. Its totient is φ = 80759669760.

The previous prime is 81018232133. The next prime is 81018232231. The reversal of 81018232151 is 15123281018.

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

It is a cyclic number.

It is not a de Polignac number, because 81018232151 - 2²² = 81014037847 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 (81018234151) 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, 334631 + ... + 523463.

It is an arithmetic number, because the mean of its divisors is an integer number (10159646868).

Almost surely, 2^81018232151 is an apocalyptic number.

81018232151 is a deficient number, since it is larger than the sum of its proper divisors (258942793).

81018232151 is a wasteful number, since it uses less digits than its factorization.

81018232151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190201.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 81018232151 in words is "eighty-one billion, eighteen million, two hundred thirty-two thousand, one hundred fifty-one".