1191880331 has 2 divisors, whose sum is σ = 1191880332. Its totient is φ = 1191880330.

The previous prime is 1191880303. The next prime is 1191880411. The reversal of 1191880331 is 1330881911.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191880331 is a prime.

It is a super-2 number, since 2×1191880331² = 2841157446849339122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1191880291 and 1191880300.

It is not a weakly prime, because it can be changed into another prime (1191880531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595940165 + 595940166.

It is an arithmetic number, because the mean of its divisors is an integer number (595940166).

Almost surely, 2^1191880331 is an apocalyptic number.

1191880331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191880331 is an equidigital number, since it uses as much as digits as its factorization.

1191880331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1191880331 is about 34523.6199000047. The cubic root of 1191880331 is about 1060.2563551679.

The spelling of 1191880331 in words is "one billion, one hundred ninety-one million, eight hundred eighty thousand, three hundred thirty-one".