3747236561 has 2 divisors, whose sum is σ = 3747236562. Its totient is φ = 3747236560.

The previous prime is 3747236489. The next prime is 3747236587. The reversal of 3747236561 is 1656327473.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1986930625 + 1760305936 = 44575^2 + 41956^2 .

It is a cyclic number.

It is not a de Polignac number, because 3747236561 - 2²² = 3743042257 is a prime.

It is a super-3 number, since 3×3747236561³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3747232561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1873618280 + 1873618281.

It is an arithmetic number, because the mean of its divisors is an integer number (1873618281).

Almost surely, 2^3747236561 is an apocalyptic number.

It is an amenable number.

3747236561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3747236561 is an equidigital number, since it uses as much as digits as its factorization.

3747236561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 44.

The square root of 3747236561 is about 61214.6760262602. The cubic root of 3747236561 is about 1553.2345304183.

The spelling of 3747236561 in words is "three billion, seven hundred forty-seven million, two hundred thirty-six thousand, five hundred sixty-one".