31223420077 has 2 divisors, whose sum is σ = 31223420078. Its totient is φ = 31223420076.

The previous prime is 31223420003. The next prime is 31223420083. The reversal of 31223420077 is 77002432213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16751089476 + 14472330601 = 129426^2 + 120301^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223420077 - 2¹⁵ = 31223387309 is a prime.

It is a super-2 number, since 2×31223420077² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223420087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611710038 + 15611710039.

It is an arithmetic number, because the mean of its divisors is an integer number (15611710039).

Almost surely, 2^31223420077 is an apocalyptic number.

It is an amenable number.

31223420077 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223420077 is an equidigital number, since it uses as much as digits as its factorization.

31223420077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

The spelling of 31223420077 in words is "thirty-one billion, two hundred twenty-three million, four hundred twenty thousand, seventy-seven".