61578523 has 2 divisors, whose sum is σ = 61578524. Its totient is φ = 61578522.

The previous prime is 61578511. The next prime is 61578533. The reversal of 61578523 is 32587516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61578523 - 2²⁵ = 28024091 is a prime.

It is not a weakly prime, because it can be changed into another prime (61578533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30789261 + 30789262.

It is an arithmetic number, because the mean of its divisors is an integer number (30789262).

Almost surely, 2^61578523 is an apocalyptic number.

61578523 is a deficient number, since it is larger than the sum of its proper divisors (1).

61578523 is an equidigital number, since it uses as much as digits as its factorization.

61578523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 61578523 is about 7847.1984172697. The cubic root of 61578523 is about 394.8902606007.

The spelling of 61578523 in words is "sixty-one million, five hundred seventy-eight thousand, five hundred twenty-three".