1551485987 has 2 divisors, whose sum is σ = 1551485988. Its totient is φ = 1551485986.

The previous prime is 1551485963. The next prime is 1551486029. The reversal of 1551485987 is 7895841551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1551485987 - 2⁸ = 1551485731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551485917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775742993 + 775742994.

It is an arithmetic number, because the mean of its divisors is an integer number (775742994).

Almost surely, 2^1551485987 is an apocalyptic number.

1551485987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551485987 is an equidigital number, since it uses as much as digits as its factorization.

1551485987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016000, while the sum is 53.

The square root of 1551485987 is about 39388.9069028324. The cubic root of 1551485987 is about 1157.6642423915.

The spelling of 1551485987 in words is "one billion, five hundred fifty-one million, four hundred eighty-five thousand, nine hundred eighty-seven".