61511053531 has 8 divisors (see below), whose sum is σ = 62946323264. Its totient is φ = 60076001160.

The previous prime is 61511053517. The next prime is 61511053567. The reversal of 61511053531 is 13535011516.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61511053531 - 2¹⁹ = 61510529243 is a prime.

It is a super-2 number, since 2×61511053531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61511053493 and 61511053502.

It is not an unprimeable number, because it can be changed into a prime (61511053831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612580 + ... + 705886.

It is an arithmetic number, because the mean of its divisors is an integer number (7868290408).

Almost surely, 2^61511053531 is an apocalyptic number.

61511053531 is a deficient number, since it is larger than the sum of its proper divisors (1435269733).

61511053531 is a wasteful number, since it uses less digits than its factorization.

61511053531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108681.

The product of its (nonzero) digits is 6750, while the sum is 31.

The spelling of 61511053531 in words is "sixty-one billion, five hundred eleven million, fifty-three thousand, five hundred thirty-one".