1373663731 has 16 divisors (see below), whose sum is σ = 1516599648. Its totient is φ = 1233792000.

The previous prime is 1373663717. The next prime is 1373663741.

It is a happy number.

1373663731 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1373663731 - 2¹⁵ = 1373630963 is a prime.

It is a super-2 number, since 2×1373663731² = 3773904091729680722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1373663741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680035 + ... + 682051.

It is an arithmetic number, because the mean of its divisors is an integer number (94787478).

Almost surely, 2^1373663731 is an apocalyptic number.

1373663731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1373663731 is a deficient number, since it is larger than the sum of its proper divisors (142935917).

1373663731 is a wasteful number, since it uses less digits than its factorization.

1373663731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742.

The product of its digits is 142884, while the sum is 40.

The square root of 1373663731 is about 37062.9698081522. The cubic root of 1373663731 is about 1111.6297060265.

The spelling of 1373663731 in words is "one billion, three hundred seventy-three million, six hundred sixty-three thousand, seven hundred thirty-one".