1309090901 has 4 divisors (see below), whose sum is σ = 1309211904. Its totient is φ = 1308969900.

The previous prime is 1309090897. The next prime is 1309090961. The reversal of 1309090901 is 1090909031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1309090901 - 2² = 1309090897 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 13 and 9090901 contains 1309090901 itself.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309090961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42485 + ... + 66506.

It is an arithmetic number, because the mean of its divisors is an integer number (327302976).

Almost surely, 2^1309090901 is an apocalyptic number.

It is an amenable number.

1309090901 is a deficient number, since it is larger than the sum of its proper divisors (121003).

1309090901 is a wasteful number, since it uses less digits than its factorization.

1309090901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121002.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1309090901 is about 36181.3612375212. The cubic root of 1309090901 is about 1093.9310129320.

Adding to 1309090901 its reverse (1090909031), we get a palindrome (2399999932).

The spelling of 1309090901 in words is "one billion, three hundred nine million, ninety thousand, nine hundred one".