61499777 has 2 divisors, whose sum is σ = 61499778. Its totient is φ = 61499776.

The previous prime is 61499747. The next prime is 61499783. The reversal of 61499777 is 77799416.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61481281 + 18496 = 7841^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61499777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61499747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30749888 + 30749889.

It is an arithmetic number, because the mean of its divisors is an integer number (30749889).

Almost surely, 2^61499777 is an apocalyptic number.

It is an amenable number.

61499777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61499777 is an equidigital number, since it uses as much as digits as its factorization.

61499777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 50.

The square root of 61499777 is about 7842.1793527055. The cubic root of 61499777 is about 394.7218615580.

The spelling of 61499777 in words is "sixty-one million, four hundred ninety-nine thousand, seven hundred seventy-seven".