1604252381 has 2 divisors, whose sum is σ = 1604252382. Its totient is φ = 1604252380.

The previous prime is 1604252371. The next prime is 1604252383. The reversal of 1604252381 is 1832524061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1132928281 + 471324100 = 33659^2 + 21710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604252381 is a prime.

It is a super-2 number, since 2×1604252381² = 5147251403888338322, which contains 22 as substring.

Together with 1604252383, 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 (1604252383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802126190 + 802126191.

It is an arithmetic number, because the mean of its divisors is an integer number (802126191).

Almost surely, 2^1604252381 is an apocalyptic number.

It is an amenable number.

1604252381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604252381 is an equidigital number, since it uses as much as digits as its factorization.

1604252381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1604252381 is about 40053.1194914953. The cubic root of 1604252381 is about 1170.6423484716.

The spelling of 1604252381 in words is "one billion, six hundred four million, two hundred fifty-two thousand, three hundred eighty-one".