1261599 has 8 divisors (see below), whose sum is σ = 1706112. Its totient is φ = 829080.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261599 is 9951621.

It is an interprime number because it is at equal distance from previous prime (1261571) and next prime (1261627).

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

It is not a de Polignac number, because 1261599 - 2⁵ = 1261567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2749 + ... + 3174.

It is an arithmetic number, because the mean of its divisors is an integer number (213264).

2^1261599 is an apocalyptic number.

1261599 is a deficient number, since it is larger than the sum of its proper divisors (444513).

1261599 is an equidigital number, since it uses as much as digits as its factorization.

1261599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5997.

The product of its digits is 4860, while the sum is 33.

The square root of 1261599 is about 1123.2092414150. The cubic root of 1261599 is about 108.0538997075.

The spelling of 1261599 in words is "one million, two hundred sixty-one thousand, five hundred ninety-nine".