71490091 has 4 divisors (see below), whose sum is σ = 71636184. Its totient is φ = 71344000.

The previous prime is 71490079. The next prime is 71490127. The reversal of 71490091 is 19009417.

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 71490091 - 2¹³ = 71481899 is a prime.

It is a super-2 number, since 2×71490091² = 10221666222376562, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71496091) 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, 72310 + ... + 73291.

It is an arithmetic number, because the mean of its divisors is an integer number (17909046).

Almost surely, 2^71490091 is an apocalyptic number.

71490091 is a deficient number, since it is larger than the sum of its proper divisors (146093).

71490091 is a wasteful number, since it uses less digits than its factorization.

71490091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146092.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 71490091 is about 8455.1813108886. The cubic root of 71490091 is about 415.0323505047.

The spelling of 71490091 in words is "seventy-one million, four hundred ninety thousand, ninety-one".