1064721771 has 12 divisors (see below), whose sum is σ = 1542849048. Its totient is φ = 707544864.

The previous prime is 1064721767. The next prime is 1064721793. The reversal of 1064721771 is 1771274601.

1064721771 is a `hidden beast` number, since 1 + 0 + 647 + 2 + 1 + 7 + 7 + 1 = 666.

It is not a de Polignac number, because 1064721771 - 2² = 1064721767 is a prime.

It is a super-2 number, since 2×1064721771² = 2267264899282752882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1064721971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186165 + ... + 191798.

It is an arithmetic number, because the mean of its divisors is an integer number (128570754).

Almost surely, 2^1064721771 is an apocalyptic number.

1064721771 is a deficient number, since it is larger than the sum of its proper divisors (478127277).

1064721771 is a wasteful number, since it uses less digits than its factorization.

1064721771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378282 (or 378279 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 1064721771 is about 32630.0746398166. The cubic root of 1064721771 is about 1021.1245354234.

The spelling of 1064721771 in words is "one billion, sixty-four million, seven hundred twenty-one thousand, seven hundred seventy-one".