61518145 has 16 divisors (see below), whose sum is σ = 79711632. Its totient is φ = 45308160.

The previous prime is 61518137. The next prime is 61518157. The reversal of 61518145 is 54181516.

It can be written as a sum of positive squares in 8 ways, for example, as 7230721 + 54287424 = 2689^2 + 7368^2 .

It is not a de Polignac number, because 61518145 - 2³ = 61518137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28939 + ... + 30991.

It is an arithmetic number, because the mean of its divisors is an integer number (4981977).

Almost surely, 2^61518145 is an apocalyptic number.

61518145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61518145 is a deficient number, since it is larger than the sum of its proper divisors (18193487).

61518145 is a wasteful number, since it uses less digits than its factorization.

61518145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its digits is 4800, while the sum is 31.

The square root of 61518145 is about 7843.3503683056. The cubic root of 61518145 is about 394.7611545431.

It can be divided in two parts, 6 and 1518145, that added together give a palindrome (1518151).

The spelling of 61518145 in words is "sixty-one million, five hundred eighteen thousand, one hundred forty-five".