61955947 has 4 divisors (see below), whose sum is σ = 62091976. Its totient is φ = 61819920.

The previous prime is 61955911. The next prime is 61955953. The reversal of 61955947 is 74955916.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61955947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61955897 and 61955906.

It is not an unprimeable number, because it can be changed into a prime (61955147) 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 3 ways as a sum of consecutive naturals, for example, 67329 + ... + 68242.

It is an arithmetic number, because the mean of its divisors is an integer number (15522994).

Almost surely, 2^61955947 is an apocalyptic number.

61955947 is a deficient number, since it is larger than the sum of its proper divisors (136029).

61955947 is a wasteful number, since it uses less digits than its factorization.

61955947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136028.

The product of its digits is 340200, while the sum is 46.

The square root of 61955947 is about 7871.2100086327. The cubic root of 61955947 is about 395.6953984353.

The spelling of 61955947 in words is "sixty-one million, nine hundred fifty-five thousand, nine hundred forty-seven".