71273145 has 16 divisors (see below), whose sum is σ = 116690112. Its totient is φ = 37128000.

The previous prime is 71273131. The next prime is 71273149. The reversal of 71273145 is 54137217.

It is not a de Polignac number, because 71273145 - 2⁸ = 71272889 is a prime.

It is a super-2 number, since 2×71273145² = 10159722396382050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71273149) 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, 54606 + ... + 55895.

It is an arithmetic number, because the mean of its divisors is an integer number (7293132).

Almost surely, 2^71273145 is an apocalyptic number.

It is an amenable number.

71273145 is a deficient number, since it is larger than the sum of its proper divisors (45416967).

71273145 is a wasteful number, since it uses less digits than its factorization.

71273145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110552.

The product of its digits is 5880, while the sum is 30.

The square root of 71273145 is about 8442.3423882238. The cubic root of 71273145 is about 414.6121018619.

The spelling of 71273145 in words is "seventy-one million, two hundred seventy-three thousand, one hundred forty-five".