7237136561 has 4 divisors (see below), whose sum is σ = 7336275492. Its totient is φ = 7137997632.

The previous prime is 7237136551. The next prime is 7237136573. The reversal of 7237136561 is 1656317327.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5871390625 + 1365745936 = 76625^2 + 36956^2 .

It is a cyclic number.

It is not a de Polignac number, because 7237136561 - 2²² = 7232942257 is a prime.

It is a super-2 number, since 2×7237136561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7237136531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49569356 + ... + 49569501.

It is an arithmetic number, because the mean of its divisors is an integer number (1834068873).

Almost surely, 2^7237136561 is an apocalyptic number.

It is an amenable number.

7237136561 is a deficient number, since it is larger than the sum of its proper divisors (99138931).

7237136561 is an equidigital number, since it uses as much as digits as its factorization.

7237136561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99138930.

The product of its digits is 158760, while the sum is 41.

The square root of 7237136561 is about 85071.3615795586. The cubic root of 7237136561 is about 1934.2929809305.

The spelling of 7237136561 in words is "seven billion, two hundred thirty-seven million, one hundred thirty-six thousand, five hundred sixty-one".