1201313309 has 4 divisors (see below), whose sum is σ = 1372929504. Its totient is φ = 1029697116.

The previous prime is 1201313303. The next prime is 1201313327. The reversal of 1201313309 is 9033131021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9033131021 = 23 ⋅392744827.

It is not a de Polignac number, because 1201313309 - 2⁸ = 1201313053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201313303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85808087 + ... + 85808100.

It is an arithmetic number, because the mean of its divisors is an integer number (343232376).

Almost surely, 2^1201313309 is an apocalyptic number.

It is an amenable number.

1201313309 is a deficient number, since it is larger than the sum of its proper divisors (171616195).

1201313309 is an equidigital number, since it uses as much as digits as its factorization.

1201313309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171616194.

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

The square root of 1201313309 is about 34659.9669503593. The cubic root of 1201313309 is about 1063.0460942511.

The spelling of 1201313309 in words is "one billion, two hundred one million, three hundred thirteen thousand, three hundred nine".