1261450653 has 8 divisors (see below), whose sum is σ = 1694211648. Its totient is φ = 834828384.

The previous prime is 1261450637. The next prime is 1261450661. The reversal of 1261450653 is 3560541621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261450653 - 2⁴ = 1261450637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261450633) 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, 1534201 + ... + 1535022.

It is an arithmetic number, because the mean of its divisors is an integer number (211776456).

Almost surely, 2^1261450653 is an apocalyptic number.

It is an amenable number.

1261450653 is a deficient number, since it is larger than the sum of its proper divisors (432760995).

1261450653 is a wasteful number, since it uses less digits than its factorization.

1261450653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069363.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1261450653 is about 35516.9065798248. The cubic root of 1261450653 is about 1080.4966431519.

The spelling of 1261450653 in words is "one billion, two hundred sixty-one million, four hundred fifty thousand, six hundred fifty-three".