1331604761 has 2 divisors, whose sum is σ = 1331604762. Its totient is φ = 1331604760.

The previous prime is 1331604749. The next prime is 1331604811. The reversal of 1331604761 is 1674061331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079779600 + 251825161 = 32860^2 + 15869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331604761 - 2⁶ = 1331604697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331604731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665802380 + 665802381.

It is an arithmetic number, because the mean of its divisors is an integer number (665802381).

Almost surely, 2^1331604761 is an apocalyptic number.

It is an amenable number.

1331604761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331604761 is an equidigital number, since it uses as much as digits as its factorization.

1331604761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1331604761 is about 36491.1600391108. The cubic root of 1331604761 is about 1100.1665756002.

The spelling of 1331604761 in words is "one billion, three hundred thirty-one million, six hundred four thousand, seven hundred sixty-one".