1561082587 has 2 divisors, whose sum is σ = 1561082588. Its totient is φ = 1561082586.

The previous prime is 1561082539. The next prime is 1561082639. The reversal of 1561082587 is 7852801651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561082587 is a prime.

It is a super-2 number, since 2×1561082587² = 4873957686869225138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1561082527) 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 as a sum of consecutive naturals, namely, 780541293 + 780541294.

It is an arithmetic number, because the mean of its divisors is an integer number (780541294).

Almost surely, 2^1561082587 is an apocalyptic number.

1561082587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561082587 is an equidigital number, since it uses as much as digits as its factorization.

1561082587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 1561082587 is about 39510.5376703481. The cubic root of 1561082587 is about 1160.0462196705.

The spelling of 1561082587 in words is "one billion, five hundred sixty-one million, eighty-two thousand, five hundred eighty-seven".