354805421 has 2 divisors, whose sum is σ = 354805422. Its totient is φ = 354805420.

The previous prime is 354805403. The next prime is 354805481. The reversal of 354805421 is 124508453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209120521 + 145684900 = 14461^2 + 12070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-354805421 is a prime.

It is equal to p_19047614 and since 354805421 and 19047614 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354805481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177402710 + 177402711.

It is an arithmetic number, because the mean of its divisors is an integer number (177402711).

Almost surely, 2^354805421 is an apocalyptic number.

It is an amenable number.

354805421 is a deficient number, since it is larger than the sum of its proper divisors (1).

354805421 is an equidigital number, since it uses as much as digits as its factorization.

354805421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 354805421 is about 18836.2793831478. The cubic root of 354805421 is about 707.9404847724.

The spelling of 354805421 in words is "three hundred fifty-four million, eight hundred five thousand, four hundred twenty-one".