1537682161 has 2 divisors, whose sum is σ = 1537682162. Its totient is φ = 1537682160.

The previous prime is 1537682129. The next prime is 1537682171. The reversal of 1537682161 is 1612867351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193357025 + 344325136 = 34545^2 + 18556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1537682161 - 2⁵ = 1537682129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1537682171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768841080 + 768841081.

It is an arithmetic number, because the mean of its divisors is an integer number (768841081).

Almost surely, 2^1537682161 is an apocalyptic number.

It is an amenable number.

1537682161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537682161 is an equidigital number, since it uses as much as digits as its factorization.

1537682161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 1537682161 is about 39213.2906168304. The cubic root of 1537682161 is about 1154.2206997990.

The spelling of 1537682161 in words is "one billion, five hundred thirty-seven million, six hundred eighty-two thousand, one hundred sixty-one".