71961511 has 2 divisors, whose sum is σ = 71961512. Its totient is φ = 71961510.

The previous prime is 71961481. The next prime is 71961529. The reversal of 71961511 is 11516917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71961511 - 2⁵ = 71961479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71961541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35980755 + 35980756.

It is an arithmetic number, because the mean of its divisors is an integer number (35980756).

Almost surely, 2^71961511 is an apocalyptic number.

71961511 is a deficient number, since it is larger than the sum of its proper divisors (1).

71961511 is an equidigital number, since it uses as much as digits as its factorization.

71961511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 31.

The square root of 71961511 is about 8483.0130849834. The cubic root of 71961511 is about 415.9426214470.

The spelling of 71961511 in words is "seventy-one million, nine hundred sixty-one thousand, five hundred eleven".