61541545 has 16 divisors (see below), whose sum is σ = 81683280. Its totient is φ = 44216064.

The previous prime is 61541539. The next prime is 61541563. The reversal of 61541545 is 54514516.

61541545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2359296 + 59182249 = 1536^2 + 7693^2 .

It is a cyclic number.

It is not a de Polignac number, because 61541545 - 2⁹ = 61541033 is a prime.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10390 + ... + 15199.

It is an arithmetic number, because the mean of its divisors is an integer number (5105205).

Almost surely, 2^61541545 is an apocalyptic number.

61541545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61541545 is a deficient number, since it is larger than the sum of its proper divisors (20141735).

61541545 is a wasteful number, since it uses less digits than its factorization.

61541545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25644.

The product of its digits is 12000, while the sum is 31.

The square root of 61541545 is about 7844.8419359475. The cubic root of 61541545 is about 394.8112006990.

The spelling of 61541545 in words is "sixty-one million, five hundred forty-one thousand, five hundred forty-five".