3945120551 has 2 divisors, whose sum is σ = 3945120552. Its totient is φ = 3945120550.

The previous prime is 3945120539. The next prime is 3945120581. The reversal of 3945120551 is 1550215493.

It is a weak prime.

It is an emirp because it is prime and its reverse (1550215493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3945120551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945120581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972560275 + 1972560276.

It is an arithmetic number, because the mean of its divisors is an integer number (1972560276).

Almost surely, 2^3945120551 is an apocalyptic number.

3945120551 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945120551 is an equidigital number, since it uses as much as digits as its factorization.

3945120551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 3945120551 is about 62810.1946422712. The cubic root of 3945120551 is about 1580.1079548894.

The spelling of 3945120551 in words is "three billion, nine hundred forty-five million, one hundred twenty thousand, five hundred fifty-one".