64191071 has 8 divisors (see below), whose sum is σ = 73735200. Its totient is φ = 54740448.

The previous prime is 64191047. The next prime is 64191079. The reversal of 64191071 is 17019146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64191071 - 2¹⁸ = 63928927 is a prime.

It is a super-2 number, since 2×64191071² = 8240987192254082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64191079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21896 + ... + 24653.

It is an arithmetic number, because the mean of its divisors is an integer number (9216900).

Almost surely, 2^64191071 is an apocalyptic number.

64191071 is a deficient number, since it is larger than the sum of its proper divisors (9544129).

64191071 is a wasteful number, since it uses less digits than its factorization.

64191071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46753.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 64191071 is about 8011.9330376633. The cubic root of 64191071 is about 400.3976691005.

The spelling of 64191071 in words is "sixty-four million, one hundred ninety-one thousand, seventy-one".