31190000423 has 2 divisors, whose sum is σ = 31190000424. Its totient is φ = 31190000422.

The previous prime is 31190000393. The next prime is 31190000447. The reversal of 31190000423 is 32400009113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31190000423 is a prime.

It is a super-2 number, since 2×31190000423² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31190000123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15595000211 + 15595000212.

It is an arithmetic number, because the mean of its divisors is an integer number (15595000212).

Almost surely, 2^31190000423 is an apocalyptic number.

31190000423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31190000423 is an equidigital number, since it uses as much as digits as its factorization.

31190000423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31190000423 its reverse (32400009113), we get a palindrome (63590009536).

The spelling of 31190000423 in words is "thirty-one billion, one hundred ninety million, four hundred twenty-three", and thus it is an aban number.