65191771 has 2 divisors, whose sum is σ = 65191772. Its totient is φ = 65191770.

The previous prime is 65191747. The next prime is 65191781. The reversal of 65191771 is 17719156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65191771 - 2¹³ = 65183579 is a prime.

It is a super-2 number, since 2×65191771² = 8499934012232882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65191771.

It is not a weakly prime, because it can be changed into another prime (65191781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32595885 + 32595886.

It is an arithmetic number, because the mean of its divisors is an integer number (32595886).

Almost surely, 2^65191771 is an apocalyptic number.

65191771 is a deficient number, since it is larger than the sum of its proper divisors (1).

65191771 is an equidigital number, since it uses as much as digits as its factorization.

65191771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 37.

The square root of 65191771 is about 8074.1421216127. The cubic root of 65191771 is about 402.4676022944.

The spelling of 65191771 in words is "sixty-five million, one hundred ninety-one thousand, seven hundred seventy-one".