39961191 has 4 divisors (see below), whose sum is σ = 53281592. Its totient is φ = 26640792.

The previous prime is 39961171. The next prime is 39961193. The reversal of 39961191 is 19116993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 39961191 - 2⁶ = 39961127 is a prime.

It is a super-2 number, since 2×39961191² = 3193793572276962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39961193) 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, 6660196 + ... + 6660201.

It is an arithmetic number, because the mean of its divisors is an integer number (13320398).

Almost surely, 2^39961191 is an apocalyptic number.

39961191 is a deficient number, since it is larger than the sum of its proper divisors (13320401).

39961191 is a wasteful number, since it uses less digits than its factorization.

39961191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320400.

The product of its digits is 13122, while the sum is 39.

The square root of 39961191 is about 6321.4864549408. The cubic root of 39961191 is about 341.8845494516.

The spelling of 39961191 in words is "thirty-nine million, nine hundred sixty-one thousand, one hundred ninety-one".