71490571 has 4 divisors (see below), whose sum is σ = 71560944. Its totient is φ = 71420200.

The previous prime is 71490563. The next prime is 71490583. The reversal of 71490571 is 17509417.

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

It is a cyclic number.

It is not a de Polignac number, because 71490571 - 2³ = 71490563 is a prime.

It is a super-2 number, since 2×71490571² = 10221803483812082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71491571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33640 + ... + 35701.

It is an arithmetic number, because the mean of its divisors is an integer number (17890236).

Almost surely, 2^71490571 is an apocalyptic number.

71490571 is a deficient number, since it is larger than the sum of its proper divisors (70373).

71490571 is a wasteful number, since it uses less digits than its factorization.

71490571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70372.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 71490571 is about 8455.2096958029. The cubic root of 71490571 is about 415.0332793751.

Adding to 71490571 its reverse (17509417), we get a palindrome (88999988).

The spelling of 71490571 in words is "seventy-one million, four hundred ninety thousand, five hundred seventy-one".