913351221 has 24 divisors (see below), whose sum is σ = 1380739360. Its totient is φ = 603297072.

The previous prime is 913351123. The next prime is 913351237. The reversal of 913351221 is 122153319.

913351221 is a `hidden beast` number, since 91 + 3 + 351 + 221 = 666.

It is not a de Polignac number, because 913351221 - 2¹⁴ = 913334837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (913351421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9246 + ... + 43728.

Almost surely, 2^913351221 is an apocalyptic number.

It is an amenable number.

913351221 is a deficient number, since it is larger than the sum of its proper divisors (467388139).

913351221 is a wasteful number, since it uses less digits than its factorization.

913351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34607 (or 34595 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 913351221 is about 30221.7011599281. The cubic root of 913351221 is about 970.2402143588.

The spelling of 913351221 in words is "nine hundred thirteen million, three hundred fifty-one thousand, two hundred twenty-one".