305091421 has 2 divisors, whose sum is σ = 305091422. Its totient is φ = 305091420.

The previous prime is 305091383. The next prime is 305091427. The reversal of 305091421 is 124190503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298771225 + 6320196 = 17285^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 305091421 - 2²⁵ = 271536989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305091427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152545710 + 152545711.

It is an arithmetic number, because the mean of its divisors is an integer number (152545711).

Almost surely, 2^305091421 is an apocalyptic number.

305091421 is the 10085-th hex number.

It is an amenable number.

305091421 is a deficient number, since it is larger than the sum of its proper divisors (1).

305091421 is an equidigital number, since it uses as much as digits as its factorization.

305091421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 305091421 is about 17466.8663760847. The cubic root of 305091421 is about 673.1987980456.

The spelling of 305091421 in words is "three hundred five million, ninety-one thousand, four hundred twenty-one".