71751091 has 2 divisors, whose sum is σ = 71751092. Its totient is φ = 71751090.

The previous prime is 71751089. The next prime is 71751149. The reversal of 71751091 is 19015717.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71751091 - 2¹ = 71751089 is a prime.

Together with 71751089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71751061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35875545 + 35875546.

It is an arithmetic number, because the mean of its divisors is an integer number (35875546).

Almost surely, 2^71751091 is an apocalyptic number.

71751091 is a deficient number, since it is larger than the sum of its proper divisors (1).

71751091 is an equidigital number, since it uses as much as digits as its factorization.

71751091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2205, while the sum is 31.

The square root of 71751091 is about 8470.6015724977. The cubic root of 71751091 is about 415.5368114926.

The spelling of 71751091 in words is "seventy-one million, seven hundred fifty-one thousand, ninety-one".