61155049 has 2 divisors, whose sum is σ = 61155050. Its totient is φ = 61155048.

The previous prime is 61155047. The next prime is 61155089. The reversal of 61155049 is 94055116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 6985449 = 7360^2 + 2643^2 .

It is a cyclic number.

It is not a de Polignac number, because 61155049 - 2¹ = 61155047 is a prime.

Together with 61155047, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61155049.

It is not a weakly prime, because it can be changed into another prime (61155047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30577524 + 30577525.

It is an arithmetic number, because the mean of its divisors is an integer number (30577525).

Almost surely, 2^61155049 is an apocalyptic number.

It is an amenable number.

61155049 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155049 is an equidigital number, since it uses as much as digits as its factorization.

61155049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 61155049 is about 7820.1693715673. The cubic root of 61155049 is about 393.9829606896.

The spelling of 61155049 in words is "sixty-one million, one hundred fifty-five thousand, forty-nine".