1954965221 has 16 divisors (see below), whose sum is σ = 2165289408. Its totient is φ = 1750272000.

The previous prime is 1954965217. The next prime is 1954965223. The reversal of 1954965221 is 1225694591.

It is a cyclic number.

It is not a de Polignac number, because 1954965221 - 2² = 1954965217 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 (1954965223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198821 + ... + 208421.

It is an arithmetic number, because the mean of its divisors is an integer number (135330588).

Almost surely, 2^1954965221 is an apocalyptic number.

1954965221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1954965221 is a deficient number, since it is larger than the sum of its proper divisors (210324187).

1954965221 is a wasteful number, since it uses less digits than its factorization.

1954965221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9892.

The product of its digits is 194400, while the sum is 44.

The square root of 1954965221 is about 44214.9886463855. The cubic root of 1954965221 is about 1250.3924572490.

The spelling of 1954965221 in words is "one billion, nine hundred fifty-four million, nine hundred sixty-five thousand, two hundred twenty-one".