91000016 has 10 divisors (see below), whose sum is σ = 176312562. Its totient is φ = 45500000.

The previous prime is 91000009. The next prime is 91000027. The reversal of 91000016 is 61000019.

It can be written as a sum of positive squares in only one way, i.e., 56190016 + 34810000 = 7496^2 + 5900^2 .

91000016 is a strobogrammatic number because it is the same when read upside-down.

It is a junction number, because it is equal to n+sod(n) for n = 90999958 and 91000003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2843735 + ... + 2843766.

Almost surely, 2^91000016 is an apocalyptic number.

It is an amenable number.

91000016 is a deficient number, since it is larger than the sum of its proper divisors (85312546).

91000016 is a wasteful number, since it uses less digits than its factorization.

91000016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687509 (or 5687503 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 91000016 is about 9539.3928527973. The cubic root of 91000016 is about 449.7941708891.

The spelling of 91000016 in words is "ninety-one million, sixteen", and thus it is an aban number and an uban number.