7131638 has 4 divisors (see below), whose sum is σ = 10697460. Its totient is φ = 3565818.

The previous prime is 7131629. The next prime is 7131647. The reversal of 7131638 is 8361317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8361317 = 463 ⋅18059.

It is an interprime number because it is at equal distance from previous prime (7131629) and next prime (7131647).

It is a self number, because there is not a number n which added to its sum of digits gives 7131638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1782908 + ... + 1782911.

It is an arithmetic number, because the mean of its divisors is an integer number (2674365).

Almost surely, 2^7131638 is an apocalyptic number.

7131638 is a deficient number, since it is larger than the sum of its proper divisors (3565822).

7131638 is a wasteful number, since it uses less digits than its factorization.

7131638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565821.

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

The square root of 7131638 is about 2670.5126848603. The cubic root of 7131638 is about 192.4847955608.

The spelling of 7131638 in words is "seven million, one hundred thirty-one thousand, six hundred thirty-eight".