354245621 has 4 divisors (see below), whose sum is σ = 357380652. Its totient is φ = 351110592.

The previous prime is 354245581. The next prime is 354245623. The reversal of 354245621 is 126542453.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126542453 = 7243 ⋅17471.

It can be written as a sum of positive squares in 2 ways, for example, as 41344900 + 312900721 = 6430^2 + 17689^2 .

It is a cyclic number.

It is not a de Polignac number, because 354245621 - 2¹⁴ = 354229237 is a prime.

It is a super-3 number, since 3×354245621³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (354245623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567346 + ... + 1567571.

It is an arithmetic number, because the mean of its divisors is an integer number (89345163).

Almost surely, 2^354245621 is an apocalyptic number.

It is an amenable number.

354245621 is a deficient number, since it is larger than the sum of its proper divisors (3135031).

354245621 is a wasteful number, since it uses less digits than its factorization.

354245621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135030.

The product of its digits is 28800, while the sum is 32.

The square root of 354245621 is about 18821.4138948167. The cubic root of 354245621 is about 707.5679672662.

Adding to 354245621 its sum of digits (32), we get a triangular number (354245653 = T₂₆₆₁₇).

The spelling of 354245621 in words is "three hundred fifty-four million, two hundred forty-five thousand, six hundred twenty-one".