61690149 has 6 divisors (see below), whose sum is σ = 89108006. Its totient is φ = 41126760.

The previous prime is 61690133. The next prime is 61690151. The reversal of 61690149 is 94109616.

61690149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 47196900 + 14493249 = 6870^2 + 3807^2 .

It is not a de Polignac number, because 61690149 - 2⁴ = 61690133 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61690129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3427222 + ... + 3427239.

Almost surely, 2^61690149 is an apocalyptic number.

It is an amenable number.

61690149 is a deficient number, since it is larger than the sum of its proper divisors (27417857).

61690149 is a wasteful number, since it uses less digits than its factorization.

61690149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6854467 (or 6854464 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 61690149 is about 7854.3076715902. The cubic root of 61690149 is about 395.1287280059.

The spelling of 61690149 in words is "sixty-one million, six hundred ninety thousand, one hundred forty-nine".