1361645137 has 4 divisors (see below), whose sum is σ = 1394856036. Its totient is φ = 1328434240.

The previous prime is 1361645119. The next prime is 1361645167. The reversal of 1361645137 is 7315461631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7315461631 = 197 ⋅37134323.

It can be written as a sum of positive squares in 2 ways, for example, as 585688401 + 775956736 = 24201^2 + 27856^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361645137 - 2²³ = 1353256529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1361645096 and 1361645105.

It is not an unprimeable number, because it can be changed into a prime (1361645167) 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, 16605388 + ... + 16605469.

It is an arithmetic number, because the mean of its divisors is an integer number (348714009).

Almost surely, 2^1361645137 is an apocalyptic number.

It is an amenable number.

1361645137 is a deficient number, since it is larger than the sum of its proper divisors (33210899).

1361645137 is an equidigital number, since it uses as much as digits as its factorization.

1361645137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33210898.

The product of its digits is 45360, while the sum is 37.

The square root of 1361645137 is about 36900.4761080396. The cubic root of 1361645137 is about 1108.3782113749.

The spelling of 1361645137 in words is "one billion, three hundred sixty-one million, six hundred forty-five thousand, one hundred thirty-seven".