61291949 has 2 divisors, whose sum is σ = 61291950. Its totient is φ = 61291948.

The previous prime is 61291933. The next prime is 61291961. The reversal of 61291949 is 94919216.

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., 58033924 + 3258025 = 7618^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 61291949 - 2⁴ = 61291933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61291969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30645974 + 30645975.

It is an arithmetic number, because the mean of its divisors is an integer number (30645975).

Almost surely, 2^61291949 is an apocalyptic number.

It is an amenable number.

61291949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61291949 is an equidigital number, since it uses as much as digits as its factorization.

61291949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The square root of 61291949 is about 7828.9174858342. The cubic root of 61291949 is about 394.2767280423.

The spelling of 61291949 in words is "sixty-one million, two hundred ninety-one thousand, nine hundred forty-nine".