61320311 has 16 divisors (see below), whose sum is σ = 68433120. Its totient is φ = 54587520.

The previous prime is 61320307. The next prime is 61320313. The reversal of 61320311 is 11302316.

It is not a de Polignac number, because 61320311 - 2² = 61320307 is a prime.

It is a super-2 number, since 2×61320311² = 7520361082273442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61320311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61320313) 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 15 ways as a sum of consecutive naturals, for example, 41300 + ... + 42758.

It is an arithmetic number, because the mean of its divisors is an integer number (4277070).

Almost surely, 2^61320311 is an apocalyptic number.

61320311 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61320311 is a deficient number, since it is larger than the sum of its proper divisors (7112809).

61320311 is a wasteful number, since it uses less digits than its factorization.

61320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 61320311 is about 7830.7286378727. The cubic root of 61320311 is about 394.3375340282.

Adding to 61320311 its reverse (11302316), we get a palindrome (72622627).

The spelling of 61320311 in words is "sixty-one million, three hundred twenty thousand, three hundred eleven".