1064171981 has 4 divisors (see below), whose sum is σ = 1110440352. Its totient is φ = 1017903612.

The previous prime is 1064171923. The next prime is 1064171987. The reversal of 1064171981 is 1891714601.

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 1064171981 - 2¹⁸ = 1063909837 is a prime.

It is a super-2 number, since 2×1064171981² = 2264924010290928722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1064171987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23134151 + ... + 23134196.

It is an arithmetic number, because the mean of its divisors is an integer number (277610088).

Almost surely, 2^1064171981 is an apocalyptic number.

It is an amenable number.

1064171981 is a deficient number, since it is larger than the sum of its proper divisors (46268371).

1064171981 is an equidigital number, since it uses as much as digits as its factorization.

1064171981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46268370.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 1064171981 is about 32621.6489620007. The cubic root of 1064171981 is about 1020.9487459254.

The spelling of 1064171981 in words is "one billion, sixty-four million, one hundred seventy-one thousand, nine hundred eighty-one".