1971472709 has 2 divisors, whose sum is σ = 1971472710. Its totient is φ = 1971472708.

The previous prime is 1971472703. The next prime is 1971472721. The reversal of 1971472709 is 9072741791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1756029025 + 215443684 = 41905^2 + 14678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971472709 - 2¹⁶ = 1971407173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971472703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985736354 + 985736355.

It is an arithmetic number, because the mean of its divisors is an integer number (985736355).

Almost surely, 2^1971472709 is an apocalyptic number.

It is an amenable number.

1971472709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971472709 is an equidigital number, since it uses as much as digits as its factorization.

1971472709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 1971472709 is about 44401.2692273543. The cubic root of 1971472709 is about 1253.9019848573.

The spelling of 1971472709 in words is "one billion, nine hundred seventy-one million, four hundred seventy-two thousand, seven hundred nine".