1421501309 has 2 divisors, whose sum is σ = 1421501310. Its totient is φ = 1421501308.

The previous prime is 1421501293. The next prime is 1421501351. The reversal of 1421501309 is 9031051241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857201284 + 564300025 = 29278^2 + 23755^2 .

It is an emirp because it is prime and its reverse (9031051241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1421501309 - 2⁴ = 1421501293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421501369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710750654 + 710750655.

It is an arithmetic number, because the mean of its divisors is an integer number (710750655).

Almost surely, 2^1421501309 is an apocalyptic number.

It is an amenable number.

1421501309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421501309 is an equidigital number, since it uses as much as digits as its factorization.

1421501309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1421501309 is about 37702.8024024740. The cubic root of 1421501309 is about 1124.3868419044.

The spelling of 1421501309 in words is "one billion, four hundred twenty-one million, five hundred one thousand, three hundred nine".