1029721897 has 4 divisors (see below), whose sum is σ = 1030995540. Its totient is φ = 1028448256.

The previous prime is 1029721873. The next prime is 1029721939. The reversal of 1029721897 is 7981279201.

1029721897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 979439616 + 50282281 = 31296^2 + 7091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1029721897 - 2²³ = 1021333289 is a prime.

It is a super-2 number, since 2×1029721897² = 2120654370322557218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1029721097) 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, 635608 + ... + 637225.

It is an arithmetic number, because the mean of its divisors is an integer number (257748885).

Almost surely, 2^1029721897 is an apocalyptic number.

It is an amenable number.

1029721897 is a deficient number, since it is larger than the sum of its proper divisors (1273643).

1029721897 is an equidigital number, since it uses as much as digits as its factorization.

1029721897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273642.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 1029721897 is about 32089.2800947606. The cubic root of 1029721897 is about 1009.8107337408.

The spelling of 1029721897 in words is "one billion, twenty-nine million, seven hundred twenty-one thousand, eight hundred ninety-seven".