1261099 has 8 divisors (see below), whose sum is σ = 1448928. Its totient is φ = 1075200.

The previous prime is 1261081. The next prime is 1261109. The reversal of 1261099 is 9901621.

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

It is not a de Polignac number, because 1261099 - 2⁷ = 1260971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261069) 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, 1449 + ... + 2149.

It is an arithmetic number, because the mean of its divisors is an integer number (181116).

2^1261099 is an apocalyptic number.

1261099 is a deficient number, since it is larger than the sum of its proper divisors (187829).

1261099 is an equidigital number, since it uses as much as digits as its factorization.

1261099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1261099 is about 1122.9866428413. The cubic root of 1261099 is about 108.0396230927.

It can be divided in two parts, 126 and 1099, that added together give a triangular number (1225 = T₄₉).

The spelling of 1261099 in words is "one million, two hundred sixty-one thousand, ninety-nine".