1301213309 has 18 divisors (see below), whose sum is σ = 1509548670. Its totient is φ = 1120624560.

The previous prime is 1301213297. The next prime is 1301213311. The reversal of 1301213309 is 9033121031.

It can be written as a sum of positive squares in only one way, i.e., 772673209 + 528540100 = 27797^2 + 22990^2 .

It is not a de Polignac number, because 1301213309 - 2²⁸ = 1032777853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301213369) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28787 + ... + 58575.

It is an arithmetic number, because the mean of its divisors is an integer number (83863815).

Almost surely, 2^1301213309 is an apocalyptic number.

1301213309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1301213309 is a deficient number, since it is larger than the sum of its proper divisors (208335361).

1301213309 is a wasteful number, since it uses less digits than its factorization.

1301213309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29849 (or 29819 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 1301213309 is about 36072.3343990932. The cubic root of 1301213309 is about 1091.7323151270.

The spelling of 1301213309 in words is "one billion, three hundred one million, two hundred thirteen thousand, three hundred nine".