1609631953 has 2 divisors, whose sum is σ = 1609631954. Its totient is φ = 1609631952.

The previous prime is 1609631939. The next prime is 1609631971. The reversal of 1609631953 is 3591369061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1404225729 + 205406224 = 37473^2 + 14332^2 .

It is a cyclic number.

It is not a de Polignac number, because 1609631953 - 2¹⁷ = 1609500881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1609631753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804815976 + 804815977.

It is an arithmetic number, because the mean of its divisors is an integer number (804815977).

Almost surely, 2^1609631953 is an apocalyptic number.

It is an amenable number.

1609631953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609631953 is an equidigital number, since it uses as much as digits as its factorization.

1609631953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 1609631953 is about 40120.2187556349. The cubic root of 1609631953 is about 1171.9494014681.

The spelling of 1609631953 in words is "one billion, six hundred nine million, six hundred thirty-one thousand, nine hundred fifty-three".