61488881 has 4 divisors (see below), whose sum is σ = 65105892. Its totient is φ = 57871872.

The previous prime is 61488863. The next prime is 61488887. The reversal of 61488881 is 18888416.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20784481 + 40704400 = 4559^2 + 6380^2 .

It is a cyclic number.

It is not a de Polignac number, because 61488881 - 2²² = 57294577 is a prime.

It is a super-2 number, since 2×61488881² = 7561764973264322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61488887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1808480 + ... + 1808513.

It is an arithmetic number, because the mean of its divisors is an integer number (16276473).

Almost surely, 2^61488881 is an apocalyptic number.

It is an amenable number.

61488881 is a deficient number, since it is larger than the sum of its proper divisors (3617011).

61488881 is a wasteful number, since it uses less digits than its factorization.

61488881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617010.

The product of its digits is 98304, while the sum is 44.

The square root of 61488881 is about 7841.4846170862. The cubic root of 61488881 is about 394.6985490429.

The spelling of 61488881 in words is "sixty-one million, four hundred eighty-eight thousand, eight hundred eighty-one".