3951 has 6 divisors (see below), whose sum is σ = 5720.
Its totient is φ = 2628.
The previous prime is 3947. The next prime is 3967. The reversal of 3951 is 1593.
3951 is nontrivially palindromic in base 2, base 8 and base 16.
It is not a de Polignac number, because 3951 - 22 = 3947 is a prime.
It is a super-2 number, since 2×39512 = 31220802, which contains 22 as substring.
It is a Duffinian number.
3951 is an undulating number in base 16.
3951 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3911) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211 + ... + 228.
23951 is an apocalyptic number.
3951 is a deficient number, since it is larger than the sum of its proper divisors (1769).
3951 is a wasteful number, since it uses less digits than its factorization.
3951 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 445 (or 442 counting only the distinct ones).
The product of its digits is 135, while the sum is 18.
The square root of 3951 is about 62.8569805193.
The cubic root of 3951 is about 15.8089251502.
Adding to 3951 its sum of digits (18), we get a square (3969 = 632).
The spelling of 3951 in words is "three thousand, nine hundred fifty-one".