91599554 has 4 divisors (see below), whose sum is σ = 137399334. Its totient is φ = 45799776.

The previous prime is 91599539. The next prime is 91599559. The reversal of 91599554 is 45599519.

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

It can be written as a sum of positive squares in only one way, i.e., 90687529 + 912025 = 9523^2 + 955^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91599499 and 91599508.

It is not an unprimeable number, because it can be changed into a prime (91599559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22899887 + ... + 22899890.

Almost surely, 2^91599554 is an apocalyptic number.

91599554 is a deficient number, since it is larger than the sum of its proper divisors (45799780).

91599554 is a wasteful number, since it uses less digits than its factorization.

91599554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45799779.

The product of its digits is 364500, while the sum is 47.

The square root of 91599554 is about 9570.7655911113. The cubic root of 91599554 is about 450.7798067371.

The spelling of 91599554 in words is "ninety-one million, five hundred ninety-nine thousand, five hundred fifty-four".