71526401 has 4 divisors (see below), whose sum is σ = 72159492. Its totient is φ = 70893312.

The previous prime is 71526391. The next prime is 71526409. The reversal of 71526401 is 10462517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22316176 + 49210225 = 4724^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 71526401 - 2²⁶ = 4417537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71526409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316376 + ... + 316601.

It is an arithmetic number, because the mean of its divisors is an integer number (18039873).

Almost surely, 2^71526401 is an apocalyptic number.

It is an amenable number.

71526401 is a deficient number, since it is larger than the sum of its proper divisors (633091).

71526401 is a wasteful number, since it uses less digits than its factorization.

71526401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633090.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 71526401 is about 8457.3282424179. The cubic root of 71526401 is about 415.1026039427.

Adding to 71526401 its reverse (10462517), we get a palindrome (81988918).

The spelling of 71526401 in words is "seventy-one million, five hundred twenty-six thousand, four hundred one".