71145397 has 8 divisors (see below), whose sum is σ = 71760600. Its totient is φ = 70533120.

The previous prime is 71145379. The next prime is 71145401. The reversal of 71145397 is 79354117.

It can be written as a sum of positive squares in 4 ways, for example, as 2686321 + 68459076 = 1639^2 + 8274^2 .

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 71145397 - 2²³ = 62756789 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 (71145317) 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, 86247 + ... + 87067.

It is an arithmetic number, because the mean of its divisors is an integer number (8970075).

Almost surely, 2^71145397 is an apocalyptic number.

It is an amenable number.

71145397 is a deficient number, since it is larger than the sum of its proper divisors (615203).

71145397 is a wasteful number, since it uses less digits than its factorization.

71145397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463.

The product of its digits is 26460, while the sum is 37.

The square root of 71145397 is about 8434.7730852703. The cubic root of 71145397 is about 414.3642406551.

The spelling of 71145397 in words is "seventy-one million, one hundred forty-five thousand, three hundred ninety-seven".