3721537 has 2 divisors, whose sum is σ = 3721538. Its totient is φ = 3721536.

The previous prime is 3721489. The next prime is 3721559. The reversal of 3721537 is 7351273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2792241 + 929296 = 1671^2 + 964^2 .

It is an emirp because it is prime and its reverse (7351273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3721537 - 2⁷ = 3721409 is a prime.

3721537 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3721337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1860768 + 1860769.

It is an arithmetic number, because the mean of its divisors is an integer number (1860769).

Almost surely, 2^3721537 is an apocalyptic number.

It is an amenable number.

3721537 is a deficient number, since it is larger than the sum of its proper divisors (1).

3721537 is an equidigital number, since it uses as much as digits as its factorization.

3721537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 28.

The square root of 3721537 is about 1929.1285597388. The cubic root of 3721537 is about 154.9675547767.

The spelling of 3721537 in words is "three million, seven hundred twenty-one thousand, five hundred thirty-seven".