1001920609 has 2 divisors, whose sum is σ = 1001920610. Its totient is φ = 1001920608.

The previous prime is 1001920553. The next prime is 1001920657. The reversal of 1001920609 is 9060291001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992061009 + 9859600 = 31497^2 + 3140^2 .

It is an emirp because it is prime and its reverse (9060291001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001920609 - 2⁹ = 1001920097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001926609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500960304 + 500960305.

It is an arithmetic number, because the mean of its divisors is an integer number (500960305).

Almost surely, 2^1001920609 is an apocalyptic number.

It is an amenable number.

1001920609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001920609 is an equidigital number, since it uses as much as digits as its factorization.

1001920609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1001920609 is about 31653.1295293214. The cubic root of 1001920609 is about 1000.6397935769.

It can be divided in two parts, 10019 and 20609, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 1001920609 in words is "one billion, one million, nine hundred twenty thousand, six hundred nine".