1361531673 has 48 divisors (see below), whose sum is σ = 2106074880. Its totient is φ = 878501376.

The previous prime is 1361531657. The next prime is 1361531719. The reversal of 1361531673 is 3761351631.

It is a happy number.

1361531673 is a `hidden beast` number, since 1 + 3 + 61 + 531 + 67 + 3 = 666.

It is not a de Polignac number, because 1361531673 - 2⁴ = 1361531657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1361531603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1107223 + ... + 1108451.

It is an arithmetic number, because the mean of its divisors is an integer number (43876560).

Almost surely, 2^1361531673 is an apocalyptic number.

It is an amenable number.

1361531673 is a deficient number, since it is larger than the sum of its proper divisors (744543207).

1361531673 is an equidigital number, since it uses as much as digits as its factorization.

1361531673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388 (or 1376 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 1361531673 is about 36898.9386432727. The cubic root of 1361531673 is about 1108.3474239803.

The spelling of 1361531673 in words is "one billion, three hundred sixty-one million, five hundred thirty-one thousand, six hundred seventy-three".