1071949261 has 2 divisors, whose sum is σ = 1071949262. Its totient is φ = 1071949260.

The previous prime is 1071949199. The next prime is 1071949271. The reversal of 1071949261 is 1629491701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971568900 + 100380361 = 31170^2 + 10019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071949261 - 2²⁷ = 937731533 is a prime.

It is a super-2 number, since 2×1071949261² = 2298150436316892242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071949271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535974630 + 535974631.

It is an arithmetic number, because the mean of its divisors is an integer number (535974631).

Almost surely, 2^1071949261 is an apocalyptic number.

It is an amenable number.

1071949261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071949261 is an equidigital number, since it uses as much as digits as its factorization.

1071949261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1071949261 is about 32740.6362338914. The cubic root of 1071949261 is about 1023.4298421668.

The spelling of 1071949261 in words is "one billion, seventy-one million, nine hundred forty-nine thousand, two hundred sixty-one".