1291230501 has 8 divisors (see below), whose sum is σ = 1878153504. Its totient is φ = 782563920.

The previous prime is 1291230491. The next prime is 1291230503. The reversal of 1291230501 is 1050321921.

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

It is not a de Polignac number, because 1291230501 - 2¹⁰ = 1291229477 is a prime.

It is a super-2 number, since 2×1291230501² = 3334552413425422002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291230503) 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, 19564066 + ... + 19564131.

It is an arithmetic number, because the mean of its divisors is an integer number (234769188).

Almost surely, 2^1291230501 is an apocalyptic number.

1291230501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1291230501 is a deficient number, since it is larger than the sum of its proper divisors (586923003).

1291230501 is a wasteful number, since it uses less digits than its factorization.

1291230501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39128211.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 1291230501 is about 35933.6958995314. The cubic root of 1291230501 is about 1088.9332494727.

The spelling of 1291230501 in words is "one billion, two hundred ninety-one million, two hundred thirty thousand, five hundred one".