61005388531 has 16 divisors (see below), whose sum is σ = 64134911808. Its totient is φ = 57917059200.

The previous prime is 61005388519. The next prime is 61005388571. The reversal of 61005388531 is 13588350016.

It is a cyclic number.

It is not a de Polignac number, because 61005388531 - 2¹⁹ = 61004864243 is a prime.

It is a super-2 number, since 2×61005388531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61005388511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891561 + ... + 1923541.

It is an arithmetic number, because the mean of its divisors is an integer number (4008431988).

Almost surely, 2^61005388531 is an apocalyptic number.

61005388531 is a deficient number, since it is larger than the sum of its proper divisors (3129523277).

61005388531 is a wasteful number, since it uses less digits than its factorization.

61005388531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32622.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 61005388531 in words is "sixty-one billion, five million, three hundred eighty-eight thousand, five hundred thirty-one".