7638131 has 4 divisors (see below), whose sum is σ = 7644000. Its totient is φ = 7632264.

The previous prime is 7638089. The next prime is 7638143. The reversal of 7638131 is 1318367.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1318367 = 17 ⋅77551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7638131 is a prime.

It is a super-2 number, since 2×7638131² = 116682090346322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7638094 and 7638103.

It is not an unprimeable number, because it can be changed into a prime (7638031) 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, 11 + ... + 3908.

It is an arithmetic number, because the mean of its divisors is an integer number (1911000).

Almost surely, 2^7638131 is an apocalyptic number.

7638131 is a deficient number, since it is larger than the sum of its proper divisors (5869).

7638131 is a wasteful number, since it uses less digits than its factorization.

7638131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868.

The product of its digits is 3024, while the sum is 29.

The square root of 7638131 is about 2763.7168813031. The cubic root of 7638131 is about 196.9377782830.

The spelling of 7638131 in words is "seven million, six hundred thirty-eight thousand, one hundred thirty-one".