1992641221 has 8 divisors (see below), whose sum is σ = 2033126424. Its totient is φ = 1952563200.

The previous prime is 1992641201. The next prime is 1992641239. The reversal of 1992641221 is 1221462991.

It can be written as a sum of positive squares in 4 ways, for example, as 519156225 + 1473484996 = 22785^2 + 38386^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1992641221 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 (1992641201) 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, 91900 + ... + 111493.

It is an arithmetic number, because the mean of its divisors is an integer number (254140803).

Almost surely, 2^1992641221 is an apocalyptic number.

It is an amenable number.

1992641221 is a deficient number, since it is larger than the sum of its proper divisors (40485203).

1992641221 is a wasteful number, since it uses less digits than its factorization.

1992641221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203591.

The product of its digits is 15552, while the sum is 37.

The square root of 1992641221 is about 44639.0100808698. The cubic root of 1992641221 is about 1258.3739040625.

The spelling of 1992641221 in words is "one billion, nine hundred ninety-two million, six hundred forty-one thousand, two hundred twenty-one".