4081951 has 4 divisors (see below), whose sum is σ = 4192312. Its totient is φ = 3971592.

The previous prime is 4081949. The next prime is 4081963. The reversal of 4081951 is 1591804.

4081951 = 9² + 10² + ... + 230².

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4081951 - 2¹ = 4081949 is a prime.

It is an Ulam number.

It is a Duffinian number.

4081951 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55125 + ... + 55198.

It is an arithmetic number, because the mean of its divisors is an integer number (1048078).

Almost surely, 2^4081951 is an apocalyptic number.

4081951 is a deficient number, since it is larger than the sum of its proper divisors (110361).

4081951 is a wasteful number, since it uses less digits than its factorization.

4081951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110360.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 4081951 is about 2020.3838744159. The cubic root of 4081951 is about 159.8168607676.

The spelling of 4081951 in words is "four million, eighty-one thousand, nine hundred fifty-one".