61281877 has 2 divisors, whose sum is σ = 61281878. Its totient is φ = 61281876.

The previous prime is 61281863. The next prime is 61281911. The reversal of 61281877 is 77818216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42954916 + 18326961 = 6554^2 + 4281^2 .

It is a cyclic number.

It is not a de Polignac number, because 61281877 - 2¹⁵ = 61249109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61281817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640938 + 30640939.

It is an arithmetic number, because the mean of its divisors is an integer number (30640939).

Almost surely, 2^61281877 is an apocalyptic number.

It is an amenable number.

61281877 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281877 is an equidigital number, since it uses as much as digits as its factorization.

61281877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 40.

The square root of 61281877 is about 7828.2742031689. The cubic root of 61281877 is about 394.2551299215.

The spelling of 61281877 in words is "sixty-one million, two hundred eighty-one thousand, eight hundred seventy-seven".