1071491231 has 2 divisors, whose sum is σ = 1071491232. Its totient is φ = 1071491230.

The previous prime is 1071491227. The next prime is 1071491261. The reversal of 1071491231 is 1321941701.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1071491231 - 2² = 1071491227 is a prime.

It is a super-2 number, since 2×1071491231² = 2296186916219790722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1071491194 and 1071491203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071491261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535745615 + 535745616.

It is an arithmetic number, because the mean of its divisors is an integer number (535745616).

Almost surely, 2^1071491231 is an apocalyptic number.

1071491231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071491231 is an equidigital number, since it uses as much as digits as its factorization.

1071491231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1071491231 is about 32733.6406621689. The cubic root of 1071491231 is about 1023.2840553064.

The spelling of 1071491231 in words is "one billion, seventy-one million, four hundred ninety-one thousand, two hundred thirty-one".