61820311 has 6 divisors (see below), whose sum is σ = 71913480. Its totient is φ = 52988796.

The previous prime is 61820273. The next prime is 61820321. The reversal of 61820311 is 11302816.

It is not a de Polignac number, because 61820311 - 2⁷ = 61820183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820321) 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 5 ways as a sum of consecutive naturals, for example, 630771 + ... + 630868.

It is an arithmetic number, because the mean of its divisors is an integer number (11985580).

Almost surely, 2^61820311 is an apocalyptic number.

61820311 is a deficient number, since it is larger than the sum of its proper divisors (10093169).

61820311 is a wasteful number, since it uses less digits than its factorization.

61820311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261653 (or 1261646 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 61820311 is about 7862.5893317660. The cubic root of 61820311 is about 395.4064309935.

The spelling of 61820311 in words is "sixty-one million, eight hundred twenty thousand, three hundred eleven".