61699049 has 8 divisors (see below), whose sum is σ = 63051912. Its totient is φ = 60353280.

The previous prime is 61699039. The next prime is 61699051. The reversal of 61699049 is 94099616.

It can be written as a sum of positive squares in 4 ways, for example, as 1357225 + 60341824 = 1165^2 + 7768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61699049 - 2¹⁶ = 61633513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61699009) 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 in 7 ways as a sum of consecutive naturals, for example, 18209 + ... + 21329.

It is an arithmetic number, because the mean of its divisors is an integer number (7881489).

Almost surely, 2^61699049 is an apocalyptic number.

It is an amenable number.

61699049 is a deficient number, since it is larger than the sum of its proper divisors (1352863).

61699049 is a wasteful number, since it uses less digits than its factorization.

61699049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 61699049 is about 7854.8742192348. The cubic root of 61699049 is about 395.1477287520.

The spelling of 61699049 in words is "sixty-one million, six hundred ninety-nine thousand, forty-nine".