1261633 has 4 divisors (see below), whose sum is σ = 1270980. Its totient is φ = 1252288.

The previous prime is 1261627. The next prime is 1261639. The reversal of 1261633 is 3361621.

1261633 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1261627) and next prime (1261639).

It can be written as a sum of positive squares in 2 ways, for example, as 446224 + 815409 = 668^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261633 - 2⁹ = 1261121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261639) 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, 4468 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (317745).

2^1261633 is an apocalyptic number.

It is an amenable number.

1261633 is a deficient number, since it is larger than the sum of its proper divisors (9347).

1261633 is an equidigital number, since it uses as much as digits as its factorization.

1261633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346.

The product of its digits is 648, while the sum is 22.

The square root of 1261633 is about 1123.2243765161. The cubic root of 1261633 is about 108.0548703803.

It can be divided in two parts, 12616 and 33, that multiplied together give a triangular number (416328 = T₉₁₂).

The spelling of 1261633 in words is "one million, two hundred sixty-one thousand, six hundred thirty-three".