61212729 has 8 divisors (see below), whose sum is σ = 85165632. Its totient is φ = 39034160.

The previous prime is 61212719. The next prime is 61212743. The reversal of 61212729 is 92721216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61212729 - 2²⁵ = 27658297 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 61212696 and 61212705.

It is not an unprimeable number, because it can be changed into a prime (61212719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443502 + ... + 443639.

It is an arithmetic number, because the mean of its divisors is an integer number (10645704).

Almost surely, 2^61212729 is an apocalyptic number.

61212729 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

61212729 is a deficient number, since it is larger than the sum of its proper divisors (23952903).

61212729 is a wasteful number, since it uses less digits than its factorization.

61212729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887167.

The product of its digits is 3024, while the sum is 30.

The square root of 61212729 is about 7823.8564020565. The cubic root of 61212729 is about 394.1067869135.

The spelling of 61212729 in words is "sixty-one million, two hundred twelve thousand, seven hundred twenty-nine".