49201661 has 4 divisors (see below), whose sum is σ = 50898300. Its totient is φ = 47505024.

The previous prime is 49201639. The next prime is 49201673. The reversal of 49201661 is 16610294.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39000025 + 10201636 = 6245^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 49201661 - 2¹⁴ = 49185277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1696609 = 49201661 / (4 + 9 + 2 + 0 + 1 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49201631) 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 3 ways as a sum of consecutive naturals, for example, 848276 + ... + 848333.

It is an arithmetic number, because the mean of its divisors is an integer number (12724575).

Almost surely, 2^49201661 is an apocalyptic number.

It is an amenable number.

49201661 is a deficient number, since it is larger than the sum of its proper divisors (1696639).

49201661 is a wasteful number, since it uses less digits than its factorization.

49201661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696638.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 49201661 is about 7014.3895671683. The cubic root of 49201661 is about 366.4318833968.

The spelling of 49201661 in words is "forty-nine million, two hundred one thousand, six hundred sixty-one".