350091221 has 4 divisors (see below), whose sum is σ = 350459532. Its totient is φ = 349722912.

The previous prime is 350091197. The next prime is 350091229. The reversal of 350091221 is 122190053.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122190053 = 23 ⋅5312611.

It can be written as a sum of positive squares in 2 ways, for example, as 283080625 + 67010596 = 16825^2 + 8186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-350091221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (350091229) 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, 182726 + ... + 184631.

It is an arithmetic number, because the mean of its divisors is an integer number (87614883).

Almost surely, 2^350091221 is an apocalyptic number.

It is an amenable number.

350091221 is a deficient number, since it is larger than the sum of its proper divisors (368311).

350091221 is an equidigital number, since it uses as much as digits as its factorization.

350091221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368310.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 350091221 is about 18710.7247588115. The cubic root of 350091221 is about 704.7910928061.

The spelling of 350091221 in words is "three hundred fifty million, ninety-one thousand, two hundred twenty-one".