31031322247477 has 2 divisors, whose sum is σ = 31031322247478. Its totient is φ = 31031322247476.

The previous prime is 31031322247427. The next prime is 31031322247483. The reversal of 31031322247477 is 77474222313013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29516554531396 + 1514767716081 = 5432914^2 + 1230759^2 .

It is an emirp because it is prime and its reverse (77474222313013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31031322247477 - 2²³ = 31031313858869 is a prime.

It is a super-2 number, since 2×31031322247477² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31031322247427) 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, 15515661123738 + 15515661123739.

It is an arithmetic number, because the mean of its divisors is an integer number (15515661123739).

Almost surely, 2^{31031322247477} is an apocalyptic number.

It is an amenable number.

31031322247477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031322247477 is an equidigital number, since it uses as much as digits as its factorization.

31031322247477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 46.

The spelling of 31031322247477 in words is "thirty-one trillion, thirty-one billion, three hundred twenty-two million, two hundred forty-seven thousand, four hundred seventy-seven".