1561387 has 8 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 1510824.

The previous prime is 1561367. The next prime is 1561393. The reversal of 1561387 is 7831651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6414 + ... + 6652.

It is an arithmetic number, because the mean of its divisors is an integer number (201600).

2^1561387 is an apocalyptic number.

1561387 is a deficient number, since it is larger than the sum of its proper divisors (51413).

1561387 is a wasteful number, since it uses less digits than its factorization.

1561387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its digits is 5040, while the sum is 31.

The square root of 1561387 is about 1249.5547206905. The cubic root of 1561387 is about 116.0121618244.

The spelling of 1561387 in words is "one million, five hundred sixty-one thousand, three hundred eighty-seven".