71129537 has 2 divisors, whose sum is σ = 71129538. Its totient is φ = 71129536.

The previous prime is 71129491. The next prime is 71129557. The reversal of 71129537 is 73592117.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68046001 + 3083536 = 8249^2 + 1756^2 .

It is an emirp because it is prime and its reverse (73592117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71129537 - 2⁶ = 71129473 is a prime.

It is a super-2 number, since 2×71129537² = 10118822067668738, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71129497 and 71129506.

It is not a weakly prime, because it can be changed into another prime (71129557) 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, 35564768 + 35564769.

It is an arithmetic number, because the mean of its divisors is an integer number (35564769).

Almost surely, 2^71129537 is an apocalyptic number.

It is an amenable number.

71129537 is a deficient number, since it is larger than the sum of its proper divisors (1).

71129537 is an equidigital number, since it uses as much as digits as its factorization.

71129537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 35.

The square root of 71129537 is about 8433.8328771680. The cubic root of 71129537 is about 414.3334478209. Note that the first 3 decimals are identical.

The spelling of 71129537 in words is "seventy-one million, one hundred twenty-nine thousand, five hundred thirty-seven".