1604999117 has 2 divisors, whose sum is σ = 1604999118. Its totient is φ = 1604999116.

The previous prime is 1604999107. The next prime is 1604999119. The reversal of 1604999117 is 7119994061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1372406116 + 232593001 = 37046^2 + 15251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604999117 - 2⁸ = 1604998861 is a prime.

Together with 1604999119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604999119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802499558 + 802499559.

It is an arithmetic number, because the mean of its divisors is an integer number (802499559).

Almost surely, 2^1604999117 is an apocalyptic number.

It is an amenable number.

1604999117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604999117 is an equidigital number, since it uses as much as digits as its factorization.

1604999117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 1604999117 is about 40062.4402277245. The cubic root of 1604999117 is about 1170.8239543913.

The spelling of 1604999117 in words is "one billion, six hundred four million, nine hundred ninety-nine thousand, one hundred seventeen".