61399277 has 2 divisors, whose sum is σ = 61399278. Its totient is φ = 61399276.

The previous prime is 61399271. The next prime is 61399301. The reversal of 61399277 is 77299316.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 9357481 = 7214^2 + 3059^2 .

It is a cyclic number.

It is not a de Polignac number, because 61399277 - 2¹² = 61395181 is a prime.

It is a super-2 number, since 2×61399277² = 7539742432245458, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61399271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30699638 + 30699639.

It is an arithmetic number, because the mean of its divisors is an integer number (30699639).

Almost surely, 2^61399277 is an apocalyptic number.

It is an amenable number.

61399277 is a deficient number, since it is larger than the sum of its proper divisors (1).

61399277 is an equidigital number, since it uses as much as digits as its factorization.

61399277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 61399277 is about 7835.7690752089. The cubic root of 61399277 is about 394.5067324558.

The spelling of 61399277 in words is "sixty-one million, three hundred ninety-nine thousand, two hundred seventy-seven".