61555487 has 16 divisors (see below), whose sum is σ = 77060160. Its totient is φ = 47943168.

The previous prime is 61555471. The next prime is 61555493. The reversal of 61555487 is 78455516.

It is not a de Polignac number, because 61555487 - 2⁴ = 61555471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555427) 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, 5468 + ... + 12369.

It is an arithmetic number, because the mean of its divisors is an integer number (4816260).

Almost surely, 2^61555487 is an apocalyptic number.

61555487 is a deficient number, since it is larger than the sum of its proper divisors (15504673).

61555487 is a wasteful number, since it uses less digits than its factorization.

61555487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17890.

The product of its digits is 168000, while the sum is 41.

The square root of 61555487 is about 7845.7304949890. The cubic root of 61555487 is about 394.8410127669.

The spelling of 61555487 in words is "sixty-one million, five hundred fifty-five thousand, four hundred eighty-seven".