3965551 has 4 divisors (see below), whose sum is σ = 4093504. Its totient is φ = 3837600.

The previous prime is 3965537. The next prime is 3965569. The reversal of 3965551 is 1555693.

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 3965551 - 2¹¹ = 3963503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965581) 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, 63930 + ... + 63991.

It is an arithmetic number, because the mean of its divisors is an integer number (1023376).

Almost surely, 2^3965551 is an apocalyptic number.

3965551 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3965551 is a deficient number, since it is larger than the sum of its proper divisors (127953).

3965551 is a wasteful number, since it uses less digits than its factorization.

3965551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127952.

The product of its digits is 20250, while the sum is 34.

The square root of 3965551 is about 1991.3691270078. The cubic root of 3965551 is about 158.2830875346.

The spelling of 3965551 in words is "three million, nine hundred sixty-five thousand, five hundred fifty-one".