309377376421 has 2 divisors, whose sum is σ = 309377376422. Its totient is φ = 309377376420.

The previous prime is 309377376389. The next prime is 309377376431. The reversal of 309377376421 is 124673773903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222181192321 + 87196184100 = 471361^2 + 295290^2 .

It is a cyclic number.

It is not a de Polignac number, because 309377376421 - 2⁵ = 309377376389 is a prime.

It is a super-2 number, since 2×309377376421² (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 (309377376431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154688688210 + 154688688211.

It is an arithmetic number, because the mean of its divisors is an integer number (154688688211).

Almost surely, 2^309377376421 is an apocalyptic number.

It is an amenable number.

309377376421 is a deficient number, since it is larger than the sum of its proper divisors (1).

309377376421 is an equidigital number, since it uses as much as digits as its factorization.

309377376421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000752, while the sum is 52.

The spelling of 309377376421 in words is "three hundred nine billion, three hundred seventy-seven million, three hundred seventy-six thousand, four hundred twenty-one".