1261512633 has 4 divisors (see below), whose sum is σ = 1682016848. Its totient is φ = 841008420.

The previous prime is 1261512617. The next prime is 1261512643. The reversal of 1261512633 is 3362151621.

1261512633 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1261512633 - 2⁴ = 1261512617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261512633.

It is not an unprimeable number, because it can be changed into a prime (1261512613) 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, 210252103 + ... + 210252108.

It is an arithmetic number, because the mean of its divisors is an integer number (420504212).

Almost surely, 2^1261512633 is an apocalyptic number.

It is an amenable number.

1261512633 is a deficient number, since it is larger than the sum of its proper divisors (420504215).

1261512633 is an equidigital number, since it uses as much as digits as its factorization.

1261512633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420504214.

The product of its digits is 6480, while the sum is 30.

The square root of 1261512633 is about 35517.7791113127. The cubic root of 1261512633 is about 1080.5143392029.

The spelling of 1261512633 in words is "one billion, two hundred sixty-one million, five hundred twelve thousand, six hundred thirty-three".