71490791 has 4 divisors (see below), whose sum is σ = 71716632. Its totient is φ = 71264952.

The previous prime is 71490779. The next prime is 71490803. The reversal of 71490791 is 19709417.

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

It is an interprime number because it is at equal distance from previous prime (71490779) and next prime (71490803).

It is a cyclic number.

It is not a de Polignac number, because 71490791 - 2²² = 67296487 is a prime.

It is a super-2 number, since 2×71490791² = 10221866395611362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71490701) 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, 112445 + ... + 113078.

It is an arithmetic number, because the mean of its divisors is an integer number (17929158).

Almost surely, 2^71490791 is an apocalyptic number.

71490791 is a deficient number, since it is larger than the sum of its proper divisors (225841).

71490791 is a wasteful number, since it uses less digits than its factorization.

71490791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225840.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 71490791 is about 8455.2227055235. Note that the first 3 decimals coincide. The cubic root of 71490791 is about 415.0337051059.

The spelling of 71490791 in words is "seventy-one million, four hundred ninety thousand, seven hundred ninety-one".