1951221 has 8 divisors (see below), whose sum is σ = 2634880. Its totient is φ = 1284192.

The previous prime is 1951199. The next prime is 1951223. The reversal of 1951221 is 1221591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1951221 - 2⁷ = 1951093 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 (1951223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3880 + ... + 4353.

It is an arithmetic number, because the mean of its divisors is an integer number (329360).

2^1951221 is an apocalyptic number.

It is an amenable number.

1951221 is a deficient number, since it is larger than the sum of its proper divisors (683659).

1951221 is an equidigital number, since it uses as much as digits as its factorization.

1951221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315.

The product of its digits is 180, while the sum is 21.

The square root of 1951221 is about 1396.8611240922. The cubic root of 1951221 is about 124.9593681272.

The spelling of 1951221 in words is "one million, nine hundred fifty-one thousand, two hundred twenty-one".