39961091 has 4 divisors (see below), whose sum is σ = 40028184. Its totient is φ = 39894000.

The previous prime is 39961069. The next prime is 39961109. The reversal of 39961091 is 19016993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19016993 = 103 ⋅184631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39961091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39961021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32645 + ... + 33846.

It is an arithmetic number, because the mean of its divisors is an integer number (10007046).

Almost surely, 2^39961091 is an apocalyptic number.

39961091 is a deficient number, since it is larger than the sum of its proper divisors (67093).

39961091 is an equidigital number, since it uses as much as digits as its factorization.

39961091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67092.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 39961091 is about 6321.4785454038. The cubic root of 39961091 is about 341.8842642709.

The spelling of 39961091 in words is "thirty-nine million, nine hundred sixty-one thousand, ninety-one".