3921551 has 2 divisors, whose sum is σ = 3921552. Its totient is φ = 3921550.

The previous prime is 3921529. The next prime is 3921559. The reversal of 3921551 is 1551293.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3921551 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3921551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960775 + 1960776.

It is an arithmetic number, because the mean of its divisors is an integer number (1960776).

Almost surely, 2^3921551 is an apocalyptic number.

3921551 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921551 is an equidigital number, since it uses as much as digits as its factorization.

3921551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 26.

The square root of 3921551 is about 1980.2906352351. The cubic root of 3921551 is about 157.6954958827.

The spelling of 3921551 in words is "three million, nine hundred twenty-one thousand, five hundred fifty-one".