1331561171 has 2 divisors, whose sum is σ = 1331561172. Its totient is φ = 1331561170.

The previous prime is 1331561123. The next prime is 1331561201. The reversal of 1331561171 is 1711651331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331561171 - 2⁶ = 1331561107 is a prime.

It is a super-2 number, since 2×1331561171² = 3546110304229782482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331561111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665780585 + 665780586.

It is an arithmetic number, because the mean of its divisors is an integer number (665780586).

Almost surely, 2^1331561171 is an apocalyptic number.

1331561171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331561171 is an equidigital number, since it uses as much as digits as its factorization.

1331561171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 1331561171 is about 36490.5627662825. The cubic root of 1331561171 is about 1100.1545708408.

The spelling of 1331561171 in words is "one billion, three hundred thirty-one million, five hundred sixty-one thousand, one hundred seventy-one".