91670143 has 4 divisors (see below), whose sum is σ = 91785960. Its totient is φ = 91554328.

The previous prime is 91670107. The next prime is 91670147. The reversal of 91670143 is 34107619.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91670143 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 (91670147) 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, 56713 + ... + 58306.

It is an arithmetic number, because the mean of its divisors is an integer number (22946490).

Almost surely, 2^91670143 is an apocalyptic number.

91670143 is a deficient number, since it is larger than the sum of its proper divisors (115817).

91670143 is a wasteful number, since it uses less digits than its factorization.

91670143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115816.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 91670143 is about 9574.4526214296. The cubic root of 91670143 is about 450.8955712217.

The spelling of 91670143 in words is "ninety-one million, six hundred seventy thousand, one hundred forty-three".