71631011 has 2 divisors, whose sum is σ = 71631012. Its totient is φ = 71631010.

The previous prime is 71630981. The next prime is 71631017. The reversal of 71631011 is 11013617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71631011 - 2¹⁸ = 71368867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71631017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35815505 + 35815506.

It is an arithmetic number, because the mean of its divisors is an integer number (35815506).

Almost surely, 2^71631011 is an apocalyptic number.

71631011 is a deficient number, since it is larger than the sum of its proper divisors (1).

71631011 is an equidigital number, since it uses as much as digits as its factorization.

71631011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 71631011 is about 8463.5105600454. The cubic root of 71631011 is about 415.3048729897.

Adding to 71631011 its reverse (11013617), we get a palindrome (82644628).

The spelling of 71631011 in words is "seventy-one million, six hundred thirty-one thousand, eleven".