61650921 has 16 divisors (see below), whose sum is σ = 85474368. Its totient is φ = 39494400.

The previous prime is 61650907. The next prime is 61650937. The reversal of 61650921 is 12905616.

It is not a de Polignac number, because 61650921 - 2⁹ = 61650409 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (61650521) 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 15 ways as a sum of consecutive naturals, for example, 4501 + ... + 11981.

It is an arithmetic number, because the mean of its divisors is an integer number (5342148).

Almost surely, 2^61650921 is an apocalyptic number.

It is an amenable number.

61650921 is a deficient number, since it is larger than the sum of its proper divisors (23823447).

61650921 is a wasteful number, since it uses less digits than its factorization.

61650921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7592.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 61650921 is about 7851.8100460977. The cubic root of 61650921 is about 395.0449577627.

The spelling of 61650921 in words is "sixty-one million, six hundred fifty thousand, nine hundred twenty-one".