71487109 has 2 divisors, whose sum is σ = 71487110. Its totient is φ = 71487108.

The previous prime is 71487103. The next prime is 71487121. The reversal of 71487109 is 90178417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63250209 + 8236900 = 7953^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 71487109 - 2⁷ = 71486981 is a prime.

It is a super-2 number, since 2×71487109² = 10220813506355762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71487103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35743554 + 35743555.

It is an arithmetic number, because the mean of its divisors is an integer number (35743555).

Almost surely, 2^71487109 is an apocalyptic number.

It is an amenable number.

71487109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71487109 is an equidigital number, since it uses as much as digits as its factorization.

71487109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 71487109 is about 8455.0049674734. The cubic root of 71487109 is about 415.0265798043.

The spelling of 71487109 in words is "seventy-one million, four hundred eighty-seven thousand, one hundred nine".