61679477 has 2 divisors, whose sum is σ = 61679478. Its totient is φ = 61679476.

The previous prime is 61679461. The next prime is 61679489. The reversal of 61679477 is 77497616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57623281 + 4056196 = 7591^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 61679477 - 2⁴ = 61679461 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 (61679437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30839738 + 30839739.

It is an arithmetic number, because the mean of its divisors is an integer number (30839739).

Almost surely, 2^61679477 is an apocalyptic number.

It is an amenable number.

61679477 is a deficient number, since it is larger than the sum of its proper divisors (1).

61679477 is an equidigital number, since it uses as much as digits as its factorization.

61679477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 47.

The square root of 61679477 is about 7853.6282697872. The cubic root of 61679477 is about 395.1059417802.

The spelling of 61679477 in words is "sixty-one million, six hundred seventy-nine thousand, four hundred seventy-seven".