31242003431 has 2 divisors, whose sum is σ = 31242003432. Its totient is φ = 31242003430.

The previous prime is 31242003389. The next prime is 31242003461. The reversal of 31242003431 is 13430024213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31242003431 - 2⁶ = 31242003367 is a prime.

It is a super-2 number, since 2×31242003431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31242003397 and 31242003406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31242003461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621001715 + 15621001716.

It is an arithmetic number, because the mean of its divisors is an integer number (15621001716).

Almost surely, 2^31242003431 is an apocalyptic number.

31242003431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242003431 is an equidigital number, since it uses as much as digits as its factorization.

31242003431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31242003431 its reverse (13430024213), we get a palindrome (44672027644).

The spelling of 31242003431 in words is "thirty-one billion, two hundred forty-two million, three thousand, four hundred thirty-one".