1941509 has 2 divisors, whose sum is σ = 1941510. Its totient is φ = 1941508.

The previous prime is 1941503. The next prime is 1941517. The reversal of 1941509 is 9051491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 9409 = 1390^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 1941509 - 2⁸ = 1941253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1941503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970754 + 970755.

It is an arithmetic number, because the mean of its divisors is an integer number (970755).

2^1941509 is an apocalyptic number.

It is an amenable number.

1941509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1941509 is an equidigital number, since it uses as much as digits as its factorization.

1941509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1941509 is about 1393.3804218518. The cubic root of 1941509 is about 124.7516990999.

The spelling of 1941509 in words is "one million, nine hundred forty-one thousand, five hundred nine".