61891225 has 24 divisors (see below), whose sum is σ = 84896352. Its totient is φ = 44380800.

The previous prime is 61891213. The next prime is 61891231. The reversal of 61891225 is 52219816.

It is not a de Polignac number, because 61891225 - 2¹⁵ = 61858457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18534 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (3537348).

Almost surely, 2^61891225 is an apocalyptic number.

It is an amenable number.

61891225 is a deficient number, since it is larger than the sum of its proper divisors (23005127).

61891225 is a wasteful number, since it uses less digits than its factorization.

61891225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177 (or 3172 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 61891225 is about 7867.0976223764. The cubic root of 61891225 is about 395.5575632914.

The spelling of 61891225 in words is "sixty-one million, eight hundred ninety-one thousand, two hundred twenty-five".