1617142987 has 2 divisors, whose sum is σ = 1617142988. Its totient is φ = 1617142986.

The previous prime is 1617142981. The next prime is 1617142999. The reversal of 1617142987 is 7892417161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1617142987 - 2¹⁵ = 1617110219 is a prime.

It is not a weakly prime, because it can be changed into another prime (1617142981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808571493 + 808571494.

It is an arithmetic number, because the mean of its divisors is an integer number (808571494).

Almost surely, 2^1617142987 is an apocalyptic number.

1617142987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617142987 is an equidigital number, since it uses as much as digits as its factorization.

1617142987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

The square root of 1617142987 is about 40213.7164037347. The cubic root of 1617142987 is about 1173.7694646138.

The spelling of 1617142987 in words is "one billion, six hundred seventeen million, one hundred forty-two thousand, nine hundred eighty-seven".