1072721017 has 4 divisors (see below), whose sum is σ = 1073742736. Its totient is φ = 1071699300.

The previous prime is 1072720973. The next prime is 1072721021. The reversal of 1072721017 is 7101272701.

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 1072721017 - 2⁷ = 1072720889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1072721047) 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, 509283 + ... + 511384.

It is an arithmetic number, because the mean of its divisors is an integer number (268435684).

Almost surely, 2^1072721017 is an apocalyptic number.

It is an amenable number.

1072721017 is a deficient number, since it is larger than the sum of its proper divisors (1021719).

1072721017 is a wasteful number, since it uses less digits than its factorization.

1072721017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021718.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 1072721017 is about 32752.4200174583. The cubic root of 1072721017 is about 1023.6753913037.

Adding to 1072721017 its reverse (7101272701), we get a palindrome (8173993718).

The spelling of 1072721017 in words is "one billion, seventy-two million, seven hundred twenty-one thousand, seventeen".