1921727801 has 8 divisors (see below), whose sum is σ = 2222721984. Its totient is φ = 1627349040.

The previous prime is 1921727791. The next prime is 1921727813. The reversal of 1921727801 is 1087271291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921727801 - 2¹⁰ = 1921726777 is a prime.

It is a super-2 number, since 2×1921727801² = 7386075482272591202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1921727831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653230 + ... + 1654391.

It is an arithmetic number, because the mean of its divisors is an integer number (277840248).

Almost surely, 2^1921727801 is an apocalyptic number.

It is an amenable number.

1921727801 is a deficient number, since it is larger than the sum of its proper divisors (300994183).

1921727801 is an equidigital number, since it uses as much as digits as its factorization.

1921727801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307711.

The product of its (nonzero) digits is 14112, while the sum is 38.

The square root of 1921727801 is about 43837.5159081807. The cubic root of 1921727801 is about 1243.2657155633.

The spelling of 1921727801 in words is "one billion, nine hundred twenty-one million, seven hundred twenty-seven thousand, eight hundred one".