61501821 has 8 divisors (see below), whose sum is σ = 82084800. Its totient is φ = 40960032.

The previous prime is 61501819. The next prime is 61501831. The reversal of 61501821 is 12810516.

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

It is not a de Polignac number, because 61501821 - 2¹ = 61501819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61501791 and 61501800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61501831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6625 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (10260600).

Almost surely, 2^61501821 is an apocalyptic number.

It is an amenable number.

61501821 is a deficient number, since it is larger than the sum of its proper divisors (20582979).

61501821 is a wasteful number, since it uses less digits than its factorization.

61501821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20595.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 61501821 is about 7842.3096725391. The cubic root of 61501821 is about 394.7262344873.

The spelling of 61501821 in words is "sixty-one million, five hundred one thousand, eight hundred twenty-one".