3891551 has 2 divisors, whose sum is σ = 3891552. Its totient is φ = 3891550.

The previous prime is 3891541. The next prime is 3891571. The reversal of 3891551 is 1551983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3891551 - 2¹⁰ = 3890527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945775 + 1945776.

It is an arithmetic number, because the mean of its divisors is an integer number (1945776).

Almost surely, 2^3891551 is an apocalyptic number.

3891551 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891551 is an equidigital number, since it uses as much as digits as its factorization.

3891551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The square root of 3891551 is about 1972.7014472545. The cubic root of 3891551 is about 157.2923407560.

The spelling of 3891551 in words is "three million, eight hundred ninety-one thousand, five hundred fifty-one".