4251561236 has 12 divisors (see below), whose sum is σ = 8012557812. Its totient is φ = 1962259008.

The previous prime is 4251561233. The next prime is 4251561287. The reversal of 4251561236 is 6321651524.

It can be written as a sum of positive squares in 2 ways, for example, as 1275204100 + 2976357136 = 35710^2 + 54556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4251561196 and 4251561205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4251561233) 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, 40880345 + ... + 40880448.

It is an arithmetic number, because the mean of its divisors is an integer number (667713151).

Almost surely, 2^4251561236 is an apocalyptic number.

It is an amenable number.

4251561236 is a deficient number, since it is larger than the sum of its proper divisors (3760996576).

4251561236 is a wasteful number, since it uses less digits than its factorization.

4251561236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81760810 (or 81760808 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 4251561236 is about 65203.9970860683. The cubic root of 4251561236 is about 1620.0042213983.

The spelling of 4251561236 in words is "four billion, two hundred fifty-one million, five hundred sixty-one thousand, two hundred thirty-six".