61653531 has 16 divisors (see below), whose sum is σ = 83427840. Its totient is φ = 40495200.

The previous prime is 61653523. The next prime is 61653533. The reversal of 61653531 is 13535616.

61653531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61653531 - 2³ = 61653523 is a prime.

It is a super-2 number, since 2×61653531² = 7602315769535922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61653533) 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 15 ways as a sum of consecutive naturals, for example, 85390 + ... + 86108.

It is an arithmetic number, because the mean of its divisors is an integer number (5214240).

Almost surely, 2^61653531 is an apocalyptic number.

61653531 is a deficient number, since it is larger than the sum of its proper divisors (21774309).

61653531 is a wasteful number, since it uses less digits than its factorization.

61653531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its digits is 8100, while the sum is 30.

The square root of 61653531 is about 7851.9762480537. The cubic root of 61653531 is about 395.0505324445.

The spelling of 61653531 in words is "sixty-one million, six hundred fifty-three thousand, five hundred thirty-one".