1310211661 has 8 divisors (see below), whose sum is σ = 1429606944. Its totient is φ = 1190863920.

The previous prime is 1310211647. The next prime is 1310211731. The reversal of 1310211661 is 1661120131.

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 1310211661 - 2¹⁷ = 1310080589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310211601) 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, 70771 + ... + 87343.

It is an arithmetic number, because the mean of its divisors is an integer number (178700868).

Almost surely, 2^1310211661 is an apocalyptic number.

1310211661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1310211661 is a deficient number, since it is larger than the sum of its proper divisors (119395283).

1310211661 is a wasteful number, since it uses less digits than its factorization.

1310211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23771.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1310211661 is about 36196.8460090102. The cubic root of 1310211661 is about 1094.2431084999.

Adding to 1310211661 its reverse (1661120131), we get a palindrome (2971331792).

The spelling of 1310211661 in words is "one billion, three hundred ten million, two hundred eleven thousand, six hundred sixty-one".