61541623 has 16 divisors (see below), whose sum is σ = 73033632. Its totient is φ = 51120000.

The previous prime is 61541621. The next prime is 61541647. The reversal of 61541623 is 32614516.

It is a cyclic number.

It is not a de Polignac number, because 61541623 - 2¹ = 61541621 is a prime.

It is a super-2 number, since 2×61541623² = 7574742722948258, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 61541591 and 61541600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61541621) 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, 12313 + ... + 16573.

It is an arithmetic number, because the mean of its divisors is an integer number (4564602).

Almost surely, 2^61541623 is an apocalyptic number.

61541623 is a deficient number, since it is larger than the sum of its proper divisors (11492009).

61541623 is a wasteful number, since it uses less digits than its factorization.

61541623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386.

The product of its digits is 4320, while the sum is 28.

The square root of 61541623 is about 7844.8469073654. The cubic root of 61541623 is about 394.8113674983.

It can be divided in two parts, 6154 and 1623, that added together give a palindrome (7777).

The spelling of 61541623 in words is "sixty-one million, five hundred forty-one thousand, six hundred twenty-three".