305213521031 has 2 divisors, whose sum is σ = 305213521032. Its totient is φ = 305213521030.

The previous prime is 305213521009. The next prime is 305213521049. The reversal of 305213521031 is 130125312503.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 305213521031 - 2²² = 305209326727 is a prime.

It is a super-2 number, since 2×305213521031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305213521091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152606760515 + 152606760516.

It is an arithmetic number, because the mean of its divisors is an integer number (152606760516).

Almost surely, 2^305213521031 is an apocalyptic number.

305213521031 is a deficient number, since it is larger than the sum of its proper divisors (1).

305213521031 is an equidigital number, since it uses as much as digits as its factorization.

305213521031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 305213521031 its reverse (130125312503), we get a palindrome (435338833534).

The spelling of 305213521031 in words is "three hundred five billion, two hundred thirteen million, five hundred twenty-one thousand, thirty-one".