61277791 has 2 divisors, whose sum is σ = 61277792. Its totient is φ = 61277790.

The previous prime is 61277767. The next prime is 61277861. The reversal of 61277791 is 19777216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61277791 - 2¹¹ = 61275743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61277761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30638895 + 30638896.

It is an arithmetic number, because the mean of its divisors is an integer number (30638896).

Almost surely, 2^61277791 is an apocalyptic number.

61277791 is a deficient number, since it is larger than the sum of its proper divisors (1).

61277791 is an equidigital number, since it uses as much as digits as its factorization.

61277791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37044, while the sum is 40.

The square root of 61277791 is about 7828.0132217568. The cubic root of 61277791 is about 394.2463673404.

The spelling of 61277791 in words is "sixty-one million, two hundred seventy-seven thousand, seven hundred ninety-one".