61138771 has 2 divisors, whose sum is σ = 61138772. Its totient is φ = 61138770.

The previous prime is 61138747. The next prime is 61138787. The reversal of 61138771 is 17783116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61138771 - 2¹¹ = 61136723 is a prime.

It is not a weakly prime, because it can be changed into another prime (61138271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569385 + 30569386.

It is an arithmetic number, because the mean of its divisors is an integer number (30569386).

Almost surely, 2^61138771 is an apocalyptic number.

61138771 is the 4180-th centered heptagonal number.

61138771 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138771 is an equidigital number, since it uses as much as digits as its factorization.

61138771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 61138771 is about 7819.1285320041. The cubic root of 61138771 is about 393.9480013317.

It can be divided in two parts, 6113 and 8771, that added together give a square (14884 = 122²).

The spelling of 61138771 in words is "sixty-one million, one hundred thirty-eight thousand, seven hundred seventy-one".