91641554 has 4 divisors (see below), whose sum is σ = 137462334. Its totient is φ = 45820776.

The previous prime is 91641547. The next prime is 91641607. The reversal of 91641554 is 45514619.

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., 51509329 + 40132225 = 7177^2 + 6335^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22910387 + ... + 22910390.

Almost surely, 2^91641554 is an apocalyptic number.

91641554 is a deficient number, since it is larger than the sum of its proper divisors (45820780).

91641554 is a wasteful number, since it uses less digits than its factorization.

91641554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45820779.

The product of its digits is 21600, while the sum is 35.

The square root of 91641554 is about 9572.9595214855. The cubic root of 91641554 is about 450.8486930221.

The spelling of 91641554 in words is "ninety-one million, six hundred forty-one thousand, five hundred fifty-four".