31503042231 has 4 divisors (see below), whose sum is σ = 42004056312. Its totient is φ = 21002028152.

The previous prime is 31503042211. The next prime is 31503042257. The reversal of 31503042231 is 13224030513.

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 31503042231 - 2⁵ = 31503042199 is a prime.

It is a super-2 number, since 2×31503042231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31503042211) 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, 5250507036 + ... + 5250507041.

It is an arithmetic number, because the mean of its divisors is an integer number (10501014078).

Almost surely, 2^31503042231 is an apocalyptic number.

31503042231 is a deficient number, since it is larger than the sum of its proper divisors (10501014081).

31503042231 is a wasteful number, since it uses less digits than its factorization.

31503042231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501014080.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 31503042231 its reverse (13224030513), we get a palindrome (44727072744).

The spelling of 31503042231 in words is "thirty-one billion, five hundred three million, forty-two thousand, two hundred thirty-one".