1029721245 has 32 divisors (see below), whose sum is σ = 1982023680. Its totient is φ = 445953600.

The previous prime is 1029721243. The next prime is 1029721267. The reversal of 1029721245 is 5421279201.

1029721245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1029721245 - 2¹ = 1029721243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1029721243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256081 + ... + 260070.

It is an arithmetic number, because the mean of its divisors is an integer number (61938240).

Almost surely, 2^1029721245 is an apocalyptic number.

1029721245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1029721245 is a deficient number, since it is larger than the sum of its proper divisors (952302435).

1029721245 is a wasteful number, since it uses less digits than its factorization.

1029721245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516185.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1029721245 is about 32089.2699356031. The cubic root of 1029721245 is about 1009.8105206099.

The spelling of 1029721245 in words is "one billion, twenty-nine million, seven hundred twenty-one thousand, two hundred forty-five".