1331180761 has 4 divisors (see below), whose sum is σ = 1344904372. Its totient is φ = 1317457152.

The previous prime is 1331180737. The next prime is 1331180779. The reversal of 1331180761 is 1670811331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1028420761 + 302760000 = 32069^2 + 17400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331180761 - 2¹⁷ = 1331049689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331150761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6861660 + ... + 6861853.

It is an arithmetic number, because the mean of its divisors is an integer number (336226093).

Almost surely, 2^1331180761 is an apocalyptic number.

It is an amenable number.

1331180761 is a deficient number, since it is larger than the sum of its proper divisors (13723611).

1331180761 is an equidigital number, since it uses as much as digits as its factorization.

1331180761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13723610.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1331180761 is about 36485.3499503568. The cubic root of 1331180761 is about 1100.0497941646.

The spelling of 1331180761 in words is "one billion, three hundred thirty-one million, one hundred eighty thousand, seven hundred sixty-one".