91631026 has 4 divisors (see below), whose sum is σ = 137446542. Its totient is φ = 45815512.

The previous prime is 91631021. The next prime is 91631051. The reversal of 91631026 is 62013619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62013619 = 1031 ⋅60149.

It can be written as a sum of positive squares in only one way, i.e., 64016001 + 27615025 = 8001^2 + 5255^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91630985 and 91631003.

It is not an unprimeable number, because it can be changed into a prime (91631021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22907755 + ... + 22907758.

Almost surely, 2^91631026 is an apocalyptic number.

91631026 is a deficient number, since it is larger than the sum of its proper divisors (45815516).

91631026 is a wasteful number, since it uses less digits than its factorization.

91631026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45815515.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91631026 is about 9572.4096234961. The cubic root of 91631026 is about 450.8314275037.

The spelling of 91631026 in words is "ninety-one million, six hundred thirty-one thousand, twenty-six".