1261533 has 16 divisors (see below), whose sum is σ = 2070656. Its totient is φ = 665280.

The previous prime is 1261531. The next prime is 1261549. The reversal of 1261533 is 3351621.

It is not a de Polignac number, because 1261533 - 2¹ = 1261531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2038 + ... + 2583.

It is an arithmetic number, because the mean of its divisors is an integer number (129416).

2^1261533 is an apocalyptic number.

1261533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1261533 is a deficient number, since it is larger than the sum of its proper divisors (809123).

1261533 is a wasteful number, since it uses less digits than its factorization.

1261533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644.

The product of its digits is 540, while the sum is 21.

The square root of 1261533 is about 1123.1798609306. The cubic root of 1261533 is about 108.0520154105.

The spelling of 1261533 in words is "one million, two hundred sixty-one thousand, five hundred thirty-three".