61505457 has 16 divisors (see below), whose sum is σ = 91166208. Its totient is φ = 36627840.

The previous prime is 61505449. The next prime is 61505459. The reversal of 61505457 is 75450516.

It is not a de Polignac number, because 61505457 - 2³ = 61505449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61505459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24228 + ... + 26645.

It is an arithmetic number, because the mean of its divisors is an integer number (5697888).

Almost surely, 2^61505457 is an apocalyptic number.

It is an amenable number.

61505457 is a deficient number, since it is larger than the sum of its proper divisors (29660751).

61505457 is a wasteful number, since it uses less digits than its factorization.

61505457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50920.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 61505457 is about 7842.5414885737. The cubic root of 61505457 is about 394.7340130988.

The spelling of 61505457 in words is "sixty-one million, five hundred five thousand, four hundred fifty-seven".