90071545 has 4 divisors (see below), whose sum is σ = 108085860. Its totient is φ = 72057232.

The previous prime is 90071521. The next prime is 90071549. The reversal of 90071545 is 54517009.

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 40284409 + 49787136 = 6347^2 + 7056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90071545 is a prime.

It is a super-2 number, since 2×90071545² = 16225766437374050, 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 not an unprimeable number, because it can be changed into a prime (90071549) 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, 9007150 + ... + 9007159.

It is an arithmetic number, because the mean of its divisors is an integer number (27021465).

Almost surely, 2^90071545 is an apocalyptic number.

It is an amenable number.

90071545 is a deficient number, since it is larger than the sum of its proper divisors (18014315).

90071545 is a wasteful number, since it uses less digits than its factorization.

90071545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18014314.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 90071545 is about 9490.6029840048. The cubic root of 90071545 is about 448.2591921302.

The spelling of 90071545 in words is "ninety million, seventy-one thousand, five hundred forty-five".