1309211949 has 8 divisors (see below), whose sum is σ = 1758174880. Its totient is φ = 866528496.

The previous prime is 1309211941. The next prime is 1309211963. The reversal of 1309211949 is 9491129031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1309211949 - 2³ = 1309211941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309211941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1569382 + ... + 1570215.

It is an arithmetic number, because the mean of its divisors is an integer number (219771860).

Almost surely, 2^1309211949 is an apocalyptic number.

It is an amenable number.

1309211949 is a deficient number, since it is larger than the sum of its proper divisors (448962931).

1309211949 is a wasteful number, since it uses less digits than its factorization.

1309211949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139739.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1309211949 is about 36183.0339938486. The cubic root of 1309211949 is about 1093.9647294804.

It can be divided in two parts, 130921 and 1949, that added together give a triangular number (132870 = T₅₁₅).

The spelling of 1309211949 in words is "one billion, three hundred nine million, two hundred eleven thousand, nine hundred forty-nine".