61881711 has 4 divisors (see below), whose sum is σ = 82508952. Its totient is φ = 41254472.

The previous prime is 61881709. The next prime is 61881713. The reversal of 61881711 is 11718816.

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

It is an interprime number because it is at equal distance from previous prime (61881709) and next prime (61881713).

It is a cyclic number.

It is not a de Polignac number, because 61881711 - 2¹ = 61881709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61881713) 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, 10313616 + ... + 10313621.

It is an arithmetic number, because the mean of its divisors is an integer number (20627238).

Almost surely, 2^61881711 is an apocalyptic number.

61881711 is a deficient number, since it is larger than the sum of its proper divisors (20627241).

61881711 is a wasteful number, since it uses less digits than its factorization.

61881711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20627240.

The product of its digits is 2688, while the sum is 33.

The square root of 61881711 is about 7866.4929288724. The cubic root of 61881711 is about 395.5372937109.

It can be divided in two parts, 618817 and 11, that added together give a triangular number (618828 = T₁₁₁₂).

The spelling of 61881711 in words is "sixty-one million, eight hundred eighty-one thousand, seven hundred eleven".