1291506 has 16 divisors (see below), whose sum is σ = 2719200. Its totient is φ = 407808.

The previous prime is 1291501. The next prime is 1291523. The reversal of 1291506 is 6051921.

1291506 = 91² + 92² + ... + 166².

It is not an unprimeable number, because it can be changed into a prime (1291501) 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, 5551 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (169950).

2^1291506 is an apocalyptic number.

1291506 is an abundant number, since it is smaller than the sum of its proper divisors (1427694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291506 is a wasteful number, since it uses less digits than its factorization.

1291506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11353.

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

The square root of 1291506 is about 1136.4444553079. Note that the first 4 decimals coincide. The cubic root of 1291506 is about 108.9010689477.

The spelling of 1291506 in words is "one million, two hundred ninety-one thousand, five hundred six".