61820869 has 4 divisors (see below), whose sum is σ = 67440960. Its totient is φ = 56200780.

The previous prime is 61820861. The next prime is 61820881. The reversal of 61820869 is 96802816.

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 61820869 - 2³ = 61820861 is a prime.

It is a super-2 number, since 2×61820869² = 7643639687830322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810029 + ... + 2810050.

It is an arithmetic number, because the mean of its divisors is an integer number (16860240).

Almost surely, 2^61820869 is an apocalyptic number.

It is an amenable number.

61820869 is a deficient number, since it is larger than the sum of its proper divisors (5620091).

61820869 is a wasteful number, since it uses less digits than its factorization.

61820869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620090.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 61820869 is about 7862.6248161794. The cubic root of 61820869 is about 395.4076206571.

The spelling of 61820869 in words is "sixty-one million, eight hundred twenty thousand, eight hundred sixty-nine".