91887545 has 8 divisors (see below), whose sum is σ = 111277320. Its totient is φ = 72835200.

The previous prime is 91887527. The next prime is 91887559. The reversal of 91887545 is 54578819.

It can be written as a sum of positive squares in 4 ways, for example, as 14077504 + 77810041 = 3752^2 + 8821^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91887545 - 2¹⁴ = 91871161 is a prime.

It is a super-2 number, since 2×91887545² = 16886641852254050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91887545.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83756 + ... + 84845.

It is an arithmetic number, because the mean of its divisors is an integer number (13909665).

Almost surely, 2^91887545 is an apocalyptic number.

It is an amenable number.

91887545 is a deficient number, since it is larger than the sum of its proper divisors (19389775).

91887545 is a wasteful number, since it uses less digits than its factorization.

91887545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168715.

The product of its digits is 403200, while the sum is 47.

The square root of 91887545 is about 9585.7991320495. The cubic root of 91887545 is about 451.2517330218.

The spelling of 91887545 in words is "ninety-one million, eight hundred eighty-seven thousand, five hundred forty-five".