1921520147 has 2 divisors, whose sum is σ = 1921520148. Its totient is φ = 1921520146.

The previous prime is 1921520143. The next prime is 1921520171. The reversal of 1921520147 is 7410251291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921520147 - 2² = 1921520143 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921520143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960760073 + 960760074.

It is an arithmetic number, because the mean of its divisors is an integer number (960760074).

Almost surely, 2^1921520147 is an apocalyptic number.

1921520147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921520147 is an equidigital number, since it uses as much as digits as its factorization.

1921520147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1921520147 is about 43835.1473933874. The cubic root of 1921520147 is about 1243.2209332242.

The spelling of 1921520147 in words is "one billion, nine hundred twenty-one million, five hundred twenty thousand, one hundred forty-seven".