61919477 has 2 divisors, whose sum is σ = 61919478. Its totient is φ = 61919476.

The previous prime is 61919467. The next prime is 61919503. The reversal of 61919477 is 77491916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56942116 + 4977361 = 7546^2 + 2231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61919477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61919467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30959738 + 30959739.

It is an arithmetic number, because the mean of its divisors is an integer number (30959739).

Almost surely, 2^61919477 is an apocalyptic number.

It is an amenable number.

61919477 is a deficient number, since it is larger than the sum of its proper divisors (1).

61919477 is an equidigital number, since it uses as much as digits as its factorization.

61919477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 44.

The square root of 61919477 is about 7868.8929971121. The cubic root of 61919477 is about 395.6177419478.

The spelling of 61919477 in words is "sixty-one million, nine hundred nineteen thousand, four hundred seventy-seven".