3551987 has 2 divisors, whose sum is σ = 3551988. Its totient is φ = 3551986.

The previous prime is 3551981. The next prime is 3552001. The reversal of 3551987 is 7891553.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3551987 - 2¹⁴ = 3535603 is a prime.

It is a super-2 number, since 2×3551987² = 25233223296338, which contains 22 as substring.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 3551987.

It is not a weakly prime, because it can be changed into another prime (3551981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775993 + 1775994.

It is an arithmetic number, because the mean of its divisors is an integer number (1775994).

Almost surely, 2^3551987 is an apocalyptic number.

3551987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551987 is an equidigital number, since it uses as much as digits as its factorization.

3551987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 3551987 is about 1884.6715894288. The cubic root of 3551987 is about 152.5774863767.

The spelling of 3551987 in words is "three million, five hundred fifty-one thousand, nine hundred eighty-seven".