61856311 has 4 divisors (see below), whose sum is σ = 67479624. Its totient is φ = 56233000.

The previous prime is 61856309. The next prime is 61856351. The reversal of 61856311 is 11365816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61856311 - 2¹ = 61856309 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 (61856351) 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, 2811640 + ... + 2811661.

It is an arithmetic number, because the mean of its divisors is an integer number (16869906).

Almost surely, 2^61856311 is an apocalyptic number.

61856311 is a deficient number, since it is larger than the sum of its proper divisors (5623313).

61856311 is a wasteful number, since it uses less digits than its factorization.

61856311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623312.

The product of its digits is 4320, while the sum is 31.

The square root of 61856311 is about 7864.8783207371. The cubic root of 61856311 is about 395.4831688222.

The spelling of 61856311 in words is "sixty-one million, eight hundred fifty-six thousand, three hundred eleven".