1299661 has 12 divisors (see below), whose sum is σ = 1493856. Its totient is φ = 1127720.

The previous prime is 1299653. The next prime is 1299673. The reversal of 1299661 is 1669921.

It is not a de Polignac number, because 1299661 - 2³ = 1299653 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2550 + ... + 3016.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2^1299661 is an apocalyptic number.

1299661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1299661 is a deficient number, since it is larger than the sum of its proper divisors (194195).

1299661 is a wasteful number, since it uses less digits than its factorization.

1299661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 501 counting only the distinct ones).

The product of its digits is 5832, while the sum is 34.

The square root of 1299661 is about 1140.0267540720. The cubic root of 1299661 is about 109.1298007586.

The spelling of 1299661 in words is "one million, two hundred ninety-nine thousand, six hundred sixty-one".