243157950931 has 4 divisors (see below), whose sum is σ = 277894801072. Its totient is φ = 208421100792.

The previous prime is 243157950899. The next prime is 243157950989. The reversal of 243157950931 is 139059751342.

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 243157950931 - 2⁵ = 243157950899 is a prime.

It is a super-2 number, since 2×243157950931² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243157950991) 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, 17368425060 + ... + 17368425073.

It is an arithmetic number, because the mean of its divisors is an integer number (69473700268).

Almost surely, 2^243157950931 is an apocalyptic number.

243157950931 is a deficient number, since it is larger than the sum of its proper divisors (34736850141).

243157950931 is an equidigital number, since it uses as much as digits as its factorization.

243157950931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34736850140.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 243157950931 in words is "two hundred forty-three billion, one hundred fifty-seven million, nine hundred fifty thousand, nine hundred thirty-one".