61945521 has 8 divisors (see below), whose sum is σ = 90102624. Its totient is φ = 37542720.

The previous prime is 61945493. The next prime is 61945531. The reversal of 61945521 is 12554916.

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

It is a de Polignac number, because none of the positive numbers 2^k-61945521 is a prime.

It is a super-2 number, since 2×61945521² = 7674495143922882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1877137 = 61945521 / (6 + 1 + 9 + 4 + 5 + 5 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61945531) 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, 938536 + ... + 938601.

It is an arithmetic number, because the mean of its divisors is an integer number (11262828).

Almost surely, 2^61945521 is an apocalyptic number.

It is an amenable number.

61945521 is a deficient number, since it is larger than the sum of its proper divisors (28157103).

61945521 is a wasteful number, since it uses less digits than its factorization.

61945521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877151.

The product of its digits is 10800, while the sum is 33.

The square root of 61945521 is about 7870.5476937758. The cubic root of 61945521 is about 395.6732012030.

The spelling of 61945521 in words is "sixty-one million, nine hundred forty-five thousand, five hundred twenty-one".