71455891 has 8 divisors (see below), whose sum is σ = 78037344. Its totient is φ = 65029440.

The previous prime is 71455877. The next prime is 71455919. The reversal of 71455891 is 19855417.

It is a happy number.

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 71455891 - 2⁷ = 71455763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71455861) 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, 37786 + ... + 39631.

It is an arithmetic number, because the mean of its divisors is an integer number (9754668).

Almost surely, 2^71455891 is an apocalyptic number.

71455891 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

71455891 is a deficient number, since it is larger than the sum of its proper divisors (6581453).

71455891 is a wasteful number, since it uses less digits than its factorization.

71455891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77501.

The product of its digits is 50400, while the sum is 40.

The square root of 71455891 is about 8453.1586404137. The cubic root of 71455891 is about 414.9661577861.

The spelling of 71455891 in words is "seventy-one million, four hundred fifty-five thousand, eight hundred ninety-one".