1291633 has 8 divisors (see below), whose sum is σ = 1516352. Its totient is φ = 1076976.

The previous prime is 1291603. The next prime is 1291637. The reversal of 1291633 is 3361921.

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 1291633 - 2¹³ = 1283441 is a prime.

It is the 1137-th Hogben number.

It is a Duffinian number.

1291633 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1291598 and 1291607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291637) by changing a digit.

It is a nontrivial repunit in base 1136.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2235 + ... + 2752.

It is an arithmetic number, because the mean of its divisors is an integer number (189544).

2^1291633 is an apocalyptic number.

It is an amenable number.

1291633 is a deficient number, since it is larger than the sum of its proper divisors (224719).

1291633 is an equidigital number, since it uses as much as digits as its factorization.

1291633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5031.

The product of its digits is 972, while the sum is 25.

The square root of 1291633 is about 1136.5003299604. The cubic root of 1291633 is about 108.9046384194.

The spelling of 1291633 in words is "one million, two hundred ninety-one thousand, six hundred thirty-three".