61651535 has 16 divisors (see below), whose sum is σ = 83492640. Its totient is φ = 43290240.

The previous prime is 61651531. The next prime is 61651543. The reversal of 61651535 is 53515616.

It is not a de Polignac number, because 61651535 - 2² = 61651531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61651531) 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, 17732 + ... + 20921.

It is an arithmetic number, because the mean of its divisors is an integer number (5218290).

Almost surely, 2^61651535 is an apocalyptic number.

61651535 is a deficient number, since it is larger than the sum of its proper divisors (21841105).

61651535 is a wasteful number, since it uses less digits than its factorization.

61651535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38698.

The product of its digits is 13500, while the sum is 32.

The square root of 61651535 is about 7851.8491452651. The cubic root of 61651535 is about 395.0462692154.

The spelling of 61651535 in words is "sixty-one million, six hundred fifty-one thousand, five hundred thirty-five".