3781516731 has 4 divisors (see below), whose sum is σ = 5042022312. Its totient is φ = 2521011152.

The previous prime is 3781516723. The next prime is 3781516757. The reversal of 3781516731 is 1376151873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1376151873 = 3 ⋅458717291.

It is a cyclic number.

It is not a de Polignac number, because 3781516731 - 2³ = 3781516723 is a prime.

It is a super-2 number, since 2×3781516731² = 28599737573665852722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3781516931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630252786 + ... + 630252791.

It is an arithmetic number, because the mean of its divisors is an integer number (1260505578).

Almost surely, 2^3781516731 is an apocalyptic number.

3781516731 is a deficient number, since it is larger than the sum of its proper divisors (1260505581).

3781516731 is a wasteful number, since it uses less digits than its factorization.

3781516731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260505580.

The product of its digits is 105840, while the sum is 42.

The square root of 3781516731 is about 61494.0381744442. The cubic root of 3781516731 is about 1557.9565523447.

The spelling of 3781516731 in words is "three billion, seven hundred eighty-one million, five hundred sixteen thousand, seven hundred thirty-one".