71390511 has 8 divisors (see below), whose sum is σ = 105763760. Its totient is φ = 47593656.

The previous prime is 71390491. The next prime is 71390513. The reversal of 71390511 is 11509317.

It is a happy number.

It is not a de Polignac number, because 71390511 - 2¹³ = 71382319 is a prime.

It is a super-2 number, since 2×71390511² = 10193210121682242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2644093 = 71390511 / (7 + 1 + 3 + 9 + 0 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71390513) 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, 1322020 + ... + 1322073.

It is an arithmetic number, because the mean of its divisors is an integer number (13220470).

Almost surely, 2^71390511 is an apocalyptic number.

71390511 is a deficient number, since it is larger than the sum of its proper divisors (34373249).

71390511 is a wasteful number, since it uses less digits than its factorization.

71390511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644102 (or 2644096 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The square root of 71390511 is about 8449.2905619348. The cubic root of 71390511 is about 414.8395586317.

Adding to 71390511 its reverse (11509317), we get a palindrome (82899828).

The spelling of 71390511 in words is "seventy-one million, three hundred ninety thousand, five hundred eleven".