1001021389 has 2 divisors, whose sum is σ = 1001021390. Its totient is φ = 1001021388.

The previous prime is 1001021377. The next prime is 1001021401. The reversal of 1001021389 is 9831201001.

It is a balanced prime because it is at equal distance from previous prime (1001021377) and next prime (1001021401).

It can be written as a sum of positive squares in only one way, i.e., 931165225 + 69856164 = 30515^2 + 8358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001021389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001021689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500510694 + 500510695.

It is an arithmetic number, because the mean of its divisors is an integer number (500510695).

Almost surely, 2^1001021389 is an apocalyptic number.

It is an amenable number.

1001021389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001021389 is an equidigital number, since it uses as much as digits as its factorization.

1001021389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1001021389 is about 31638.9220581233. The cubic root of 1001021389 is about 1000.3403471507.

The spelling of 1001021389 in words is "one billion, one million, twenty-one thousand, three hundred eighty-nine".