61512225 has 12 divisors (see below), whose sum is σ = 101700336. Its totient is φ = 32806480.

The previous prime is 61512223. The next prime is 61512247. The reversal of 61512225 is 52221516.

It is a happy number.

It is not a de Polignac number, because 61512225 - 2¹ = 61512223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61512195 and 61512204.

It is not an unprimeable number, because it can be changed into a prime (61512223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410007 + ... + 410156.

It is an arithmetic number, because the mean of its divisors is an integer number (8475028).

Almost surely, 2^61512225 is an apocalyptic number.

It is an amenable number.

61512225 is a deficient number, since it is larger than the sum of its proper divisors (40188111).

61512225 is a wasteful number, since it uses less digits than its factorization.

61512225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820176 (or 820171 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 61512225 is about 7842.9729694804. The cubic root of 61512225 is about 394.7484912819.

The spelling of 61512225 in words is "sixty-one million, five hundred twelve thousand, two hundred twenty-five".