1009821479 has 4 divisors (see below), whose sum is σ = 1011524976. Its totient is φ = 1008117984.

The previous prime is 1009821469. The next prime is 1009821523. The reversal of 1009821479 is 9741289001.

1009821479 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, and also an emirpimes, since its reverse is a distinct semiprime: 9741289001 = 127 ⋅76703063.

It is a cyclic number.

It is not a de Polignac number, because 1009821479 - 2¹² = 1009817383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009821469) 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, 850859 + ... + 852044.

It is an arithmetic number, because the mean of its divisors is an integer number (252881244).

Almost surely, 2^1009821479 is an apocalyptic number.

1009821479 is a deficient number, since it is larger than the sum of its proper divisors (1703497).

1009821479 is an equidigital number, since it uses as much as digits as its factorization.

1009821479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703496.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1009821479 is about 31777.6883835184. The cubic root of 1009821479 is about 1003.2631664954.

The spelling of 1009821479 in words is "one billion, nine million, eight hundred twenty-one thousand, four hundred seventy-nine".