1361727481 has 4 divisors (see below), whose sum is σ = 1362724992. Its totient is φ = 1360729972.

The previous prime is 1361727431. The next prime is 1361727491. The reversal of 1361727481 is 1847271631.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1847271631 = 10973 ⋅168347.

It is a cyclic number.

It is not a de Polignac number, because 1361727481 - 2²⁹ = 824856569 is a prime.

It is a super-2 number, since 2×1361727481² = 3708603465021210722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361727431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496705 + ... + 499438.

It is an arithmetic number, because the mean of its divisors is an integer number (340681248).

Almost surely, 2^1361727481 is an apocalyptic number.

It is an amenable number.

1361727481 is a deficient number, since it is larger than the sum of its proper divisors (997511).

1361727481 is an equidigital number, since it uses as much as digits as its factorization.

1361727481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997510.

The product of its digits is 56448, while the sum is 40.

The square root of 1361727481 is about 36901.5918491330. The cubic root of 1361727481 is about 1108.4005535778.

The spelling of 1361727481 in words is "one billion, three hundred sixty-one million, seven hundred twenty-seven thousand, four hundred eighty-one".