354518921 has 2 divisors, whose sum is σ = 354518922. Its totient is φ = 354518920.

The previous prime is 354518869. The next prime is 354518981. The reversal of 354518921 is 129815453.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351750025 + 2768896 = 18755^2 + 1664^2 .

It is an emirp because it is prime and its reverse (129815453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354518921 - 2¹⁰ = 354517897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (354518981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177259460 + 177259461.

It is an arithmetic number, because the mean of its divisors is an integer number (177259461).

Almost surely, 2^354518921 is an apocalyptic number.

It is an amenable number.

354518921 is a deficient number, since it is larger than the sum of its proper divisors (1).

354518921 is an equidigital number, since it uses as much as digits as its factorization.

354518921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 354518921 is about 18828.6728422372. The cubic root of 354518921 is about 707.7498830566.

The spelling of 354518921 in words is "three hundred fifty-four million, five hundred eighteen thousand, nine hundred twenty-one".