3723165421 has 2 divisors, whose sum is σ = 3723165422. Its totient is φ = 3723165420.

The previous prime is 3723165409. The next prime is 3723165437. The reversal of 3723165421 is 1245613273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2243916900 + 1479248521 = 47370^2 + 38461^2 .

It is a cyclic number.

It is not a de Polignac number, because 3723165421 - 2⁵ = 3723165389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3723165451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1861582710 + 1861582711.

It is an arithmetic number, because the mean of its divisors is an integer number (1861582711).

Almost surely, 2^3723165421 is an apocalyptic number.

It is an amenable number.

3723165421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3723165421 is an equidigital number, since it uses as much as digits as its factorization.

3723165421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 3723165421 is about 61017.7467709190. The cubic root of 3723165421 is about 1549.9015436594.

Adding to 3723165421 its reverse (1245613273), we get a palindrome (4968778694).

The spelling of 3723165421 in words is "three billion, seven hundred twenty-three million, one hundred sixty-five thousand, four hundred twenty-one".