61281949 has 2 divisors, whose sum is σ = 61281950. Its totient is φ = 61281948.

The previous prime is 61281917. The next prime is 61281977. The reversal of 61281949 is 94918216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52461049 + 8820900 = 7243^2 + 2970^2 .

It is a cyclic number.

It is not a de Polignac number, because 61281949 - 2⁵ = 61281917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61201949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640974 + 30640975.

It is an arithmetic number, because the mean of its divisors is an integer number (30640975).

Almost surely, 2^61281949 is an apocalyptic number.

It is an amenable number.

61281949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281949 is an equidigital number, since it uses as much as digits as its factorization.

61281949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 61281949 is about 7828.2788018823. The cubic root of 61281949 is about 394.2552843248.

The spelling of 61281949 in words is "sixty-one million, two hundred eighty-one thousand, nine hundred forty-nine".