1351863561 has 16 divisors (see below), whose sum is σ = 1852318208. Its totient is φ = 876355200.

The previous prime is 1351863559. The next prime is 1351863577. The reversal of 1351863561 is 1653681531.

It is not a de Polignac number, because 1351863561 - 2¹ = 1351863559 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351863551) 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 15 ways as a sum of consecutive naturals, for example, 277416 + ... + 282246.

It is an arithmetic number, because the mean of its divisors is an integer number (115769888).

Almost surely, 2^1351863561 is an apocalyptic number.

It is an amenable number.

1351863561 is a deficient number, since it is larger than the sum of its proper divisors (500454647).

1351863561 is a wasteful number, since it uses less digits than its factorization.

1351863561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392.

The product of its digits is 64800, while the sum is 39.

The square root of 1351863561 is about 36767.6972490799. The cubic root of 1351863561 is about 1105.7177652070.

The spelling of 1351863561 in words is "one billion, three hundred fifty-one million, eight hundred sixty-three thousand, five hundred sixty-one".