61820429 has 4 divisors (see below), whose sum is σ = 67440480. Its totient is φ = 56200380.

The previous prime is 61820399. The next prime is 61820453. The reversal of 61820429 is 92402816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61820429 - 2⁸ = 61820173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61820395 and 61820404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810009 + ... + 2810030.

It is an arithmetic number, because the mean of its divisors is an integer number (16860120).

Almost surely, 2^61820429 is an apocalyptic number.

It is an amenable number.

61820429 is a deficient number, since it is larger than the sum of its proper divisors (5620051).

61820429 is a wasteful number, since it uses less digits than its factorization.

61820429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620050.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 61820429 is about 7862.5968356517. The cubic root of 61820429 is about 395.4066825717.

The spelling of 61820429 in words is "sixty-one million, eight hundred twenty thousand, four hundred twenty-nine".