61955 has 4 divisors (see below), whose sum is σ = 74352. Its totient is φ = 49560.

The previous prime is 61949. The next prime is 61961. The reversal of 61955 is 55916.

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 (61949) and next prime (61961).

It is not a de Polignac number, because 61955 - 2¹² = 57859 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13 and base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6191 + ... + 6200.

It is an arithmetic number, because the mean of its divisors is an integer number (18588).

2⁶¹⁹⁵⁵ is an apocalyptic number.

61955 is a deficient number, since it is larger than the sum of its proper divisors (12397).

61955 is a wasteful number, since it uses less digits than its factorization.

61955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12396.

The product of its digits is 1350, while the sum is 26.

The square root of 61955 is about 248.9076133830. The cubic root of 61955 is about 39.5693382350.

The spelling of 61955 in words is "sixty-one thousand, nine hundred fifty-five".