1261811 has 8 divisors (see below), whose sum is σ = 1317840. Its totient is φ = 1207008.

The previous prime is 1261801. The next prime is 1261823. The reversal of 1261811 is 1181621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261811 - 2⁶ = 1261747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261801) 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, 2225 + ... + 2733.

It is an arithmetic number, because the mean of its divisors is an integer number (164730).

2^1261811 is an apocalyptic number.

1261811 is a deficient number, since it is larger than the sum of its proper divisors (56029).

1261811 is an equidigital number, since it uses as much as digits as its factorization.

1261811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613.

The product of its digits is 96, while the sum is 20.

The square root of 1261811 is about 1123.3036098936. The cubic root of 1261811 is about 108.0599518534.

The spelling of 1261811 in words is "one million, two hundred sixty-one thousand, eight hundred eleven".