1987413409 has 2 divisors, whose sum is σ = 1987413410. Its totient is φ = 1987413408.

The previous prime is 1987413403. The next prime is 1987413457. The reversal of 1987413409 is 9043147891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1318053025 + 669360384 = 36305^2 + 25872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987413409 - 2³ = 1987413401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1987413401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993706704 + 993706705.

It is an arithmetic number, because the mean of its divisors is an integer number (993706705).

Almost surely, 2^1987413409 is an apocalyptic number.

It is an amenable number.

1987413409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987413409 is an equidigital number, since it uses as much as digits as its factorization.

1987413409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1987413409 is about 44580.4150833076. The cubic root of 1987413409 is about 1257.2724675050.

The spelling of 1987413409 in words is "one billion, nine hundred eighty-seven million, four hundred thirteen thousand, four hundred nine".