1604652421 has 2 divisors, whose sum is σ = 1604652422. Its totient is φ = 1604652420.

The previous prime is 1604652407. The next prime is 1604652449. The reversal of 1604652421 is 1242564061.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121312196 + 483340225 = 33486^2 + 21985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604652421 is a prime.

It is a super-2 number, since 2×1604652421² = 5149818784442322482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604682421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802326210 + 802326211.

It is an arithmetic number, because the mean of its divisors is an integer number (802326211).

Almost surely, 2^1604652421 is an apocalyptic number.

It is an amenable number.

1604652421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604652421 is an equidigital number, since it uses as much as digits as its factorization.

1604652421 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 31.

The square root of 1604652421 is about 40058.1130484200. The cubic root of 1604652421 is about 1170.7396450587.

The spelling of 1604652421 in words is "one billion, six hundred four million, six hundred fifty-two thousand, four hundred twenty-one".