1247525161 has 16 divisors (see below), whose sum is σ = 1438387200. Its totient is φ = 1073979648.

The previous prime is 1247525143. The next prime is 1247525171. The reversal of 1247525161 is 1615257421.

It is a cyclic number.

It is not a de Polignac number, because 1247525161 - 2¹⁹ = 1247000873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247525101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57225 + ... + 75958.

It is an arithmetic number, because the mean of its divisors is an integer number (89899200).

Almost surely, 2^1247525161 is an apocalyptic number.

It is an amenable number.

1247525161 is a deficient number, since it is larger than the sum of its proper divisors (190862039).

1247525161 is a wasteful number, since it uses less digits than its factorization.

1247525161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133248.

The product of its digits is 16800, while the sum is 34.

The square root of 1247525161 is about 35320.3222097421. The cubic root of 1247525161 is about 1076.5059581252.

It can be divided in two parts, 12475 and 25161, that added together give a square (37636 = 194²).

The spelling of 1247525161 in words is "one billion, two hundred forty-seven million, five hundred twenty-five thousand, one hundred sixty-one".