1617161587 has 4 divisors (see below), whose sum is σ = 1654770040. Its totient is φ = 1579553136.

The previous prime is 1617161569. The next prime is 1617161653. The reversal of 1617161587 is 7851617161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1617161587 - 2¹⁵ = 1617128819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 37608409 = 1617161587 / (1 + 6 + 1 + 7 + 1 + 6 + 1 + 5 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617161527) 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 in 3 ways as a sum of consecutive naturals, for example, 18804162 + ... + 18804247.

It is an arithmetic number, because the mean of its divisors is an integer number (413692510).

Almost surely, 2^1617161587 is an apocalyptic number.

1617161587 is a deficient number, since it is larger than the sum of its proper divisors (37608453).

1617161587 is an equidigital number, since it uses as much as digits as its factorization.

1617161587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37608452.

The product of its digits is 70560, while the sum is 43.

The square root of 1617161587 is about 40213.9476674449. The cubic root of 1617161587 is about 1173.7739647370.

The spelling of 1617161587 in words is "one billion, six hundred seventeen million, one hundred sixty-one thousand, five hundred eighty-seven".