1291531461 has 8 divisors (see below), whose sum is σ = 1878591264. Its totient is φ = 782746320.

The previous prime is 1291531459. The next prime is 1291531487. The reversal of 1291531461 is 1641351921.

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

It is not a de Polignac number, because 1291531461 - 2¹ = 1291531459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 39137317 = 1291531461 / (1 + 2 + 9 + 1 + 5 + 3 + 1 + 4 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291531561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19568626 + ... + 19568691.

It is an arithmetic number, because the mean of its divisors is an integer number (234823908).

Almost surely, 2^1291531461 is an apocalyptic number.

1291531461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1291531461 is a deficient number, since it is larger than the sum of its proper divisors (587059803).

1291531461 is a wasteful number, since it uses less digits than its factorization.

1291531461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39137331.

The product of its digits is 6480, while the sum is 33.

The square root of 1291531461 is about 35937.8833683900. The cubic root of 1291531461 is about 1089.0178457529.

The spelling of 1291531461 in words is "one billion, two hundred ninety-one million, five hundred thirty-one thousand, four hundred sixty-one".