61650121 has 4 divisors (see below), whose sum is σ = 66392452. Its totient is φ = 56907792.

The previous prime is 61650119. The next prime is 61650133. The reversal of 61650121 is 12105616.

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 16491721 + 45158400 = 4061^2 + 6720^2 .

It is a cyclic number.

It is not a de Polignac number, because 61650121 - 2¹ = 61650119 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61650092 and 61650101.

It is not an unprimeable number, because it can be changed into a prime (61650151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2371146 + ... + 2371171.

It is an arithmetic number, because the mean of its divisors is an integer number (16598113).

Almost surely, 2^61650121 is an apocalyptic number.

It is an amenable number.

61650121 is a deficient number, since it is larger than the sum of its proper divisors (4742331).

61650121 is a wasteful number, since it uses less digits than its factorization.

61650121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742330.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 61650121 is about 7851.7591022649. The cubic root of 61650121 is about 395.0432490165.

Adding to 61650121 its reverse (12105616), we get a palindrome (73755737).

The spelling of 61650121 in words is "sixty-one million, six hundred fifty thousand, one hundred twenty-one".