3537169721 has 2 divisors, whose sum is σ = 3537169722. Its totient is φ = 3537169720.

The previous prime is 3537169717. The next prime is 3537169799. The reversal of 3537169721 is 1279617353.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3032044096 + 505125625 = 55064^2 + 22475^2 .

It is a cyclic number.

It is not a de Polignac number, because 3537169721 - 2² = 3537169717 is a prime.

It is not a weakly prime, because it can be changed into another prime (3537169421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1768584860 + 1768584861.

It is an arithmetic number, because the mean of its divisors is an integer number (1768584861).

Almost surely, 2^3537169721 is an apocalyptic number.

It is an amenable number.

3537169721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3537169721 is an equidigital number, since it uses as much as digits as its factorization.

3537169721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 3537169721 is about 59474.1096696705. The cubic root of 3537169721 is about 1523.6502931674.

The spelling of 3537169721 in words is "three billion, five hundred thirty-seven million, one hundred sixty-nine thousand, seven hundred twenty-one".