1610406521 has 2 divisors, whose sum is σ = 1610406522. Its totient is φ = 1610406520.

The previous prime is 1610406517. The next prime is 1610406557. The reversal of 1610406521 is 1256040161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1286226496 + 324180025 = 35864^2 + 18005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1610406521 - 2² = 1610406517 is a prime.

It is not a weakly prime, because it can be changed into another prime (1610405521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805203260 + 805203261.

It is an arithmetic number, because the mean of its divisors is an integer number (805203261).

Almost surely, 2^1610406521 is an apocalyptic number.

It is an amenable number.

1610406521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610406521 is an equidigital number, since it uses as much as digits as its factorization.

1610406521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1610406521 is about 40129.8706825726. The cubic root of 1610406521 is about 1172.1373551873.

Adding to 1610406521 its reverse (1256040161), we get a palindrome (2866446682).

The spelling of 1610406521 in words is "one billion, six hundred ten million, four hundred six thousand, five hundred twenty-one".