71250891 has 4 divisors (see below), whose sum is σ = 95001192. Its totient is φ = 47500592.

The previous prime is 71250889. The next prime is 71250913. The reversal of 71250891 is 19805217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19805217 = 3 ⋅6601739.

It is a cyclic number.

It is not a de Polignac number, because 71250891 - 2¹ = 71250889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71250821) 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, 11875146 + ... + 11875151.

It is an arithmetic number, because the mean of its divisors is an integer number (23750298).

Almost surely, 2^71250891 is an apocalyptic number.

71250891 is a deficient number, since it is larger than the sum of its proper divisors (23750301).

71250891 is a wasteful number, since it uses less digits than its factorization.

71250891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23750300.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 71250891 is about 8441.0242861871. The cubic root of 71250891 is about 414.5689451760.

The spelling of 71250891 in words is "seventy-one million, two hundred fifty thousand, eight hundred ninety-one".