61506331 has 4 divisors (see below), whose sum is σ = 61777512. Its totient is φ = 61235152.

The previous prime is 61506293. The next prime is 61506349. The reversal of 61506331 is 13360516.

61506331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 61506331 - 2¹⁵ = 61473563 is a prime.

It is a super-2 number, since 2×61506331² = 7566057506163122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61506296 and 61506305.

It is not an unprimeable number, because it can be changed into a prime (61506131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135250 + ... + 135703.

It is an arithmetic number, because the mean of its divisors is an integer number (15444378).

Almost surely, 2^61506331 is an apocalyptic number.

61506331 is a deficient number, since it is larger than the sum of its proper divisors (271181).

61506331 is a wasteful number, since it uses less digits than its factorization.

61506331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271180.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 61506331 is about 7842.5972101084. The cubic root of 61506331 is about 394.7358828293.

Adding to 61506331 its reverse (13360516), we get a palindrome (74866847).

The spelling of 61506331 in words is "sixty-one million, five hundred six thousand, three hundred thirty-one".