91872143 has 16 divisors (see below), whose sum is σ = 105138432. Its totient is φ = 79464000.

The previous prime is 91872113. The next prime is 91872173. The reversal of 91872143 is 34127819.

It is an interprime number because it is at equal distance from previous prime (91872113) and next prime (91872173).

It is not a de Polignac number, because 91872143 - 2¹² = 91868047 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 (91872113) 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, 52523 + ... + 54243.

It is an arithmetic number, because the mean of its divisors is an integer number (6571152).

Almost surely, 2^91872143 is an apocalyptic number.

91872143 is a deficient number, since it is larger than the sum of its proper divisors (13266289).

91872143 is a wasteful number, since it uses less digits than its factorization.

91872143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966.

The product of its digits is 12096, while the sum is 35.

The square root of 91872143 is about 9584.9957224821. The cubic root of 91872143 is about 451.2265189860.

The spelling of 91872143 in words is "ninety-one million, eight hundred seventy-two thousand, one hundred forty-three".