1565720087 has 2 divisors, whose sum is σ = 1565720088. Its totient is φ = 1565720086.

The previous prime is 1565720059. The next prime is 1565720089. The reversal of 1565720087 is 7800275651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1565720087 - 2²² = 1561525783 is a prime.

It is a super-4 number, since 4×1565720087⁴ (a number of 38 digits) contains 4444 as substring.

Together with 1565720089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1565720089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782860043 + 782860044.

It is an arithmetic number, because the mean of its divisors is an integer number (782860044).

Almost surely, 2^1565720087 is an apocalyptic number.

1565720087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1565720087 is an equidigital number, since it uses as much as digits as its factorization.

1565720087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 1565720087 is about 39569.1810251362. The cubic root of 1565720087 is about 1161.1937984938.

The spelling of 1565720087 in words is "one billion, five hundred sixty-five million, seven hundred twenty thousand, eighty-seven".