61903621 has 8 divisors (see below), whose sum is σ = 68816384. Its totient is φ = 55298160.

The previous prime is 61903609. The next prime is 61903637. The reversal of 61903621 is 12630916.

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

It is a cyclic number.

It is not a de Polignac number, because 61903621 - 2⁷ = 61903493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61903621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61903421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76401 + ... + 77206.

It is an arithmetic number, because the mean of its divisors is an integer number (8602048).

Almost surely, 2^61903621 is an apocalyptic number.

It is an amenable number.

61903621 is a deficient number, since it is larger than the sum of its proper divisors (6912763).

61903621 is a wasteful number, since it uses less digits than its factorization.

61903621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153651.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 61903621 is about 7867.8854211281. The cubic root of 61903621 is about 395.5839698578.

The spelling of 61903621 in words is "sixty-one million, nine hundred three thousand, six hundred twenty-one".