91139738 has 8 divisors (see below), whose sum is σ = 138245940. Its totient is φ = 45057760.

The previous prime is 91139729. The next prime is 91139743. The reversal of 91139738 is 83793119.

It can be written as a sum of positive squares in 2 ways, for example, as 90193009 + 946729 = 9497^2 + 973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 91139695 and 91139704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255833 + ... + 256188.

Almost surely, 2^91139738 is an apocalyptic number.

91139738 is a deficient number, since it is larger than the sum of its proper divisors (47106202).

91139738 is a wasteful number, since it uses less digits than its factorization.

91139738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512112.

The product of its digits is 40824, while the sum is 41.

The square root of 91139738 is about 9546.7134659002. The cubic root of 91139738 is about 450.0242587745.

The spelling of 91139738 in words is "ninety-one million, one hundred thirty-nine thousand, seven hundred thirty-eight".