1291749441 has 4 divisors (see below), whose sum is σ = 1722332592. Its totient is φ = 861166292.

The previous prime is 1291749427. The next prime is 1291749451. The reversal of 1291749441 is 1449471921.

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: 1449471921 = 3 ⋅483157307.

It is a cyclic number.

It is not a de Polignac number, because 1291749441 - 2⁶ = 1291749377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291749393 and 1291749402.

It is not an unprimeable number, because it can be changed into a prime (1291749401) 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, 215291571 + ... + 215291576.

It is an arithmetic number, because the mean of its divisors is an integer number (430583148).

Almost surely, 2^1291749441 is an apocalyptic number.

It is an amenable number.

1291749441 is a deficient number, since it is larger than the sum of its proper divisors (430583151).

1291749441 is an equidigital number, since it uses as much as digits as its factorization.

1291749441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430583150.

The product of its digits is 72576, while the sum is 42.

The square root of 1291749441 is about 35940.9159733026. The cubic root of 1291749441 is about 1089.0791091351.

The spelling of 1291749441 in words is "one billion, two hundred ninety-one million, seven hundred forty-nine thousand, four hundred forty-one".