65191901 has 4 divisors (see below), whose sum is σ = 65235072. Its totient is φ = 65148732.

The previous prime is 65191897. The next prime is 65191921. The reversal of 65191901 is 10919156.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65191901 - 2² = 65191897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65191921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19235 + ... + 22368.

It is an arithmetic number, because the mean of its divisors is an integer number (16308768).

Almost surely, 2^65191901 is an apocalyptic number.

It is an amenable number.

65191901 is a deficient number, since it is larger than the sum of its proper divisors (43171).

65191901 is a wasteful number, since it uses less digits than its factorization.

65191901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43170.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 65191901 is about 8074.1501719995. The cubic root of 65191901 is about 402.4678698167.

The spelling of 65191901 in words is "sixty-five million, one hundred ninety-one thousand, nine hundred one".