61530531 has 16 divisors (see below), whose sum is σ = 91440000. Its totient is φ = 36574848.

The previous prime is 61530527. The next prime is 61530533. The reversal of 61530531 is 13503516.

It is not a de Polignac number, because 61530531 - 2² = 61530527 is a prime.

It is a super-2 number, since 2×61530531² = 7572012490283922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61530533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30781 + ... + 32718.

It is an arithmetic number, because the mean of its divisors is an integer number (5715000).

Almost surely, 2^61530531 is an apocalyptic number.

61530531 is a deficient number, since it is larger than the sum of its proper divisors (29909469).

61530531 is a wasteful number, since it uses less digits than its factorization.

61530531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63538.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 61530531 is about 7844.1399146114. The cubic root of 61530531 is about 394.7876463667.

The spelling of 61530531 in words is "sixty-one million, five hundred thirty thousand, five hundred thirty-one".