91634 has 4 divisors (see below), whose sum is σ = 137454. Its totient is φ = 45816.

The previous prime is 91631. The next prime is 91639. The reversal of 91634 is 43619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43619 = 53 ⋅823.

It can be written as a sum of positive squares in only one way, i.e., 61009 + 30625 = 247^2 + 175^2 .

It is not an unprimeable number, because it can be changed into a prime (91631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22907 + ... + 22910.

2⁹¹⁶³⁴ is an apocalyptic number.

91634 is a deficient number, since it is larger than the sum of its proper divisors (45820).

91634 is a wasteful number, since it uses less digits than its factorization.

91634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45819.

The product of its digits is 648, while the sum is 23.

The square root of 91634 is about 302.7110833782. The cubic root of 91634 is about 45.0836304884.

It can be divided in two parts, 9 and 1634, that multiplied together give a triangular number (14706 = T₁₇₁).

The spelling of 91634 in words is "ninety-one thousand, six hundred thirty-four".