1291137439 has 8 divisors (see below), whose sum is σ = 1304710560. Its totient is φ = 1277580000.

The previous prime is 1291137431. The next prime is 1291137451. The reversal of 1291137439 is 9347311921.

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

It is a cyclic number.

It is not a de Polignac number, because 1291137439 - 2³ = 1291137431 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 (1291137431) 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, 238614 + ... + 243964.

It is an arithmetic number, because the mean of its divisors is an integer number (163088820).

Almost surely, 2^1291137439 is an apocalyptic number.

1291137439 is a deficient number, since it is larger than the sum of its proper divisors (13573121).

1291137439 is a wasteful number, since it uses less digits than its factorization.

1291137439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7841.

The product of its digits is 40824, while the sum is 40.

The square root of 1291137439 is about 35932.4009634758. The cubic root of 1291137439 is about 1088.9070881894.

The spelling of 1291137439 in words is "one billion, two hundred ninety-one million, one hundred thirty-seven thousand, four hundred thirty-nine".