31140144421 has 2 divisors, whose sum is σ = 31140144422. Its totient is φ = 31140144420.

The previous prime is 31140144359. The next prime is 31140144461. The reversal of 31140144421 is 12444104113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18738872100 + 12401272321 = 136890^2 + 111361^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140144421 - 2¹¹ = 31140142373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31140144461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570072210 + 15570072211.

It is an arithmetic number, because the mean of its divisors is an integer number (15570072211).

Almost surely, 2^31140144421 is an apocalyptic number.

It is an amenable number.

31140144421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140144421 is an equidigital number, since it uses as much as digits as its factorization.

31140144421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 31140144421 its reverse (12444104113), we get a palindrome (43584248534).

It can be divided in two parts, 31140 and 144421, that added together give a square (175561 = 419²).

The spelling of 31140144421 in words is "thirty-one billion, one hundred forty million, one hundred forty-four thousand, four hundred twenty-one".