1020321139 has 4 divisors (see below), whose sum is σ = 1047897424. Its totient is φ = 992744856.

The previous prime is 1020321053. The next prime is 1020321149. The reversal of 1020321139 is 9311230201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020321139 - 2¹³ = 1020312947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020321149) 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, 13788087 + ... + 13788160.

It is an arithmetic number, because the mean of its divisors is an integer number (261974356).

Almost surely, 2^1020321139 is an apocalyptic number.

1020321139 is a deficient number, since it is larger than the sum of its proper divisors (27576285).

1020321139 is an equidigital number, since it uses as much as digits as its factorization.

1020321139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27576284.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1020321139 is about 31942.4660757431. The cubic root of 1020321139 is about 1006.7283408968.

The spelling of 1020321139 in words is "one billion, twenty million, three hundred twenty-one thousand, one hundred thirty-nine".