61511312 has 20 divisors (see below), whose sum is σ = 120092016. Its totient is φ = 30519840.

The previous prime is 61511311. The next prime is 61511327. The reversal of 61511312 is 21311516.

It is a super-4 number, since 4×61511312⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (61511311) 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, 12578 + ... + 16769.

Almost surely, 2^61511312 is an apocalyptic number.

It is an amenable number.

61511312 is a deficient number, since it is larger than the sum of its proper divisors (58580704).

61511312 is a wasteful number, since it uses less digits than its factorization.

61511312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29486 (or 29480 counting only the distinct ones).

The product of its digits is 180, while the sum is 20.

The square root of 61511312 is about 7842.9147642952. The cubic root of 61511312 is about 394.7465382439.

Adding to 61511312 its reverse (21311516), we get a palindrome (82822828).

The spelling of 61511312 in words is "sixty-one million, five hundred eleven thousand, three hundred twelve".