61129877 has 2 divisors, whose sum is σ = 61129878. Its totient is φ = 61129876.

The previous prime is 61129853. The next prime is 61129903. The reversal of 61129877 is 77892116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 2775556 = 7639^2 + 1666^2 .

It is a cyclic number.

It is not a de Polignac number, because 61129877 - 2¹⁰ = 61128853 is a prime.

It is a Chen prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61129577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30564938 + 30564939.

It is an arithmetic number, because the mean of its divisors is an integer number (30564939).

Almost surely, 2^61129877 is an apocalyptic number.

It is an amenable number.

61129877 is a deficient number, since it is larger than the sum of its proper divisors (1).

61129877 is an equidigital number, since it uses as much as digits as its factorization.

61129877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 61129877 is about 7818.5597778619. The cubic root of 61129877 is about 393.9288975596.

The spelling of 61129877 in words is "sixty-one million, one hundred twenty-nine thousand, eight hundred seventy-seven".