61477961 has 4 divisors (see below), whose sum is σ = 61511424. Its totient is φ = 61444500.

The previous prime is 61477937. The next prime is 61477973. The reversal of 61477961 is 16977416.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61477961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61477931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13805 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (15377856).

Almost surely, 2^61477961 is an apocalyptic number.

It is an amenable number.

61477961 is a deficient number, since it is larger than the sum of its proper divisors (33463).

61477961 is a wasteful number, since it uses less digits than its factorization.

61477961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33462.

The product of its digits is 63504, while the sum is 41.

The square root of 61477961 is about 7840.7882894515. The cubic root of 61477961 is about 394.6751824154.

The spelling of 61477961 in words is "sixty-one million, four hundred seventy-seven thousand, nine hundred sixty-one".