61555427 has 2 divisors, whose sum is σ = 61555428. Its totient is φ = 61555426.

The previous prime is 61555423. The next prime is 61555433. The reversal of 61555427 is 72455516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61555427 - 2² = 61555423 is a prime.

It is not a weakly prime, because it can be changed into another prime (61555423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777713 + 30777714.

It is an arithmetic number, because the mean of its divisors is an integer number (30777714).

Almost surely, 2^61555427 is an apocalyptic number.

61555427 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555427 is an equidigital number, since it uses as much as digits as its factorization.

61555427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 35.

The square root of 61555427 is about 7845.7266712523. The cubic root of 61555427 is about 394.8408844790.

The spelling of 61555427 in words is "sixty-one million, five hundred fifty-five thousand, four hundred twenty-seven".