1953540509 has 2 divisors, whose sum is σ = 1953540510. Its totient is φ = 1953540508.

The previous prime is 1953540367. The next prime is 1953540557. The reversal of 1953540509 is 9050453591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1916513284 + 37027225 = 43778^2 + 6085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1953540509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1953540559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 976770254 + 976770255.

It is an arithmetic number, because the mean of its divisors is an integer number (976770255).

Almost surely, 2^1953540509 is an apocalyptic number.

It is an amenable number.

1953540509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1953540509 is an equidigital number, since it uses as much as digits as its factorization.

1953540509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 1953540509 is about 44198.8745218699. The cubic root of 1953540509 is about 1250.0886356348.

The spelling of 1953540509 in words is "one billion, nine hundred fifty-three million, five hundred forty thousand, five hundred nine".