7155642131 has 4 divisors (see below), whose sum is σ = 7806155064. Its totient is φ = 6505129200.

The previous prime is 7155642119. The next prime is 7155642133. The reversal of 7155642131 is 1312465517.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7155642131 - 2¹⁰ = 7155641107 is a prime.

It is a super-2 number, since 2×7155642131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7155642091 and 7155642100.

It is not an unprimeable number, because it can be changed into a prime (7155642133) 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, 325256450 + ... + 325256471.

It is an arithmetic number, because the mean of its divisors is an integer number (1951538766).

Almost surely, 2^7155642131 is an apocalyptic number.

7155642131 is a deficient number, since it is larger than the sum of its proper divisors (650512933).

7155642131 is a wasteful number, since it uses less digits than its factorization.

7155642131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650512932.

The product of its digits is 25200, while the sum is 35.

The square root of 7155642131 is about 84591.0286673475. The cubic root of 7155642131 is about 1927.0051299744.

The spelling of 7155642131 in words is "seven billion, one hundred fifty-five million, six hundred forty-two thousand, one hundred thirty-one".