1587961 has 2 divisors, whose sum is σ = 1587962. Its totient is φ = 1587960.

The previous prime is 1587959. The next prime is 1587973. The reversal of 1587961 is 1697851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587600 + 361 = 1260^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587961 - 2¹ = 1587959 is a prime.

Together with 1587959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1587961.

It is not a weakly prime, because it can be changed into another prime (1587991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793980 + 793981.

It is an arithmetic number, because the mean of its divisors is an integer number (793981).

2^1587961 is an apocalyptic number.

It is an amenable number.

1587961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587961 is an equidigital number, since it uses as much as digits as its factorization.

1587961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The square root of 1587961 is about 1260.1432458256. The cubic root of 1587961 is about 116.6666185941. Note that the first 4 decimals are identical.

The spelling of 1587961 in words is "one million, five hundred eighty-seven thousand, nine hundred sixty-one".