1350639561 has 4 divisors (see below), whose sum is σ = 1800852752. Its totient is φ = 900426372.

The previous prime is 1350639523. The next prime is 1350639593. The reversal of 1350639561 is 1659360531.

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 1350639561 - 2⁶ = 1350639497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1350639161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225106591 + ... + 225106596.

It is an arithmetic number, because the mean of its divisors is an integer number (450213188).

Almost surely, 2^1350639561 is an apocalyptic number.

It is an amenable number.

1350639561 is a deficient number, since it is larger than the sum of its proper divisors (450213191).

1350639561 is an equidigital number, since it uses as much as digits as its factorization.

1350639561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450213190.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 1350639561 is about 36751.0484340243. The cubic root of 1350639561 is about 1105.3839526211.

The spelling of 1350639561 in words is "one billion, three hundred fifty million, six hundred thirty-nine thousand, five hundred sixty-one".