1002131621 has 2 divisors, whose sum is σ = 1002131622. Its totient is φ = 1002131620.

The previous prime is 1002131609. The next prime is 1002131633. The reversal of 1002131621 is 1261312001.

It is a balanced prime because it is at equal distance from previous prime (1002131609) and next prime (1002131633).

It can be written as a sum of positive squares in only one way, i.e., 946792900 + 55338721 = 30770^2 + 7439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002131621 - 2²⁶ = 935022757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002131621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002131671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501065810 + 501065811.

It is an arithmetic number, because the mean of its divisors is an integer number (501065811).

Almost surely, 2^1002131621 is an apocalyptic number.

It is an amenable number.

1002131621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002131621 is an equidigital number, since it uses as much as digits as its factorization.

1002131621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1002131621 is about 31656.4625471640. The cubic root of 1002131621 is about 1000.7100360628.

Adding to 1002131621 its reverse (1261312001), we get a palindrome (2263443622).

The spelling of 1002131621 in words is "one billion, two million, one hundred thirty-one thousand, six hundred twenty-one".