61099949 has 2 divisors, whose sum is σ = 61099950. Its totient is φ = 61099948.

The previous prime is 61099939. The next prime is 61099981. The reversal of 61099949 is 94999016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58828900 + 2271049 = 7670^2 + 1507^2 .

It is a cyclic number.

It is not a de Polignac number, because 61099949 - 2⁴ = 61099933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61099919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30549974 + 30549975.

It is an arithmetic number, because the mean of its divisors is an integer number (30549975).

Almost surely, 2^61099949 is an apocalyptic number.

It is an amenable number.

61099949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61099949 is an equidigital number, since it uses as much as digits as its factorization.

61099949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 61099949 is about 7816.6456360769. The cubic root of 61099949 is about 393.8646004209.

The spelling of 61099949 in words is "sixty-one million, ninety-nine thousand, nine hundred forty-nine".