1371661731 has 12 divisors (see below), whose sum is σ = 2161406520. Its totient is φ = 831310080.

The previous prime is 1371661729. The next prime is 1371661769.

It is a happy number.

1371661731 is a `hidden beast` number, since 1 + 3 + 7 + 1 + 6 + 617 + 31 = 666.

1371661731 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1371661731 - 2¹ = 1371661729 is a prime.

It is a super-2 number, since 2×1371661731² = 3762911808579832722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1371661531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6927486 + ... + 6927683.

It is an arithmetic number, because the mean of its divisors is an integer number (180117210).

Almost surely, 2^1371661731 is an apocalyptic number.

1371661731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1371661731 is a deficient number, since it is larger than the sum of its proper divisors (789744789).

1371661731 is a wasteful number, since it uses less digits than its factorization.

1371661731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13855186 (or 13855183 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 1371661731 is about 37035.9518711211. The cubic root of 1371661731 is about 1111.0894076868.

The spelling of 1371661731 in words is "one billion, three hundred seventy-one million, six hundred sixty-one thousand, seven hundred thirty-one".