354273721 has 2 divisors, whose sum is σ = 354273722. Its totient is φ = 354273720.

The previous prime is 354273719. The next prime is 354273737. The reversal of 354273721 is 127372453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293745321 + 60528400 = 17139^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 354273721 - 2¹ = 354273719 is a prime.

It is a super-3 number, since 3×354273721³ (a number of 27 digits) contains 333 as substring.

Together with 354273719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (354273121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177136860 + 177136861.

It is an arithmetic number, because the mean of its divisors is an integer number (177136861).

Almost surely, 2^354273721 is an apocalyptic number.

It is an amenable number.

354273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

354273721 is an equidigital number, since it uses as much as digits as its factorization.

354273721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 34.

The square root of 354273721 is about 18822.1603701594. The cubic root of 354273721 is about 707.5866756924.

The spelling of 354273721 in words is "three hundred fifty-four million, two hundred seventy-three thousand, seven hundred twenty-one".