61651225 has 6 divisors (see below), whose sum is σ = 76447550. Its totient is φ = 49320960.

The previous prime is 61651211. The next prime is 61651237. The reversal of 61651225 is 52215616.

It can be written as a sum of positive squares in 3 ways, for example, as 10342656 + 51308569 = 3216^2 + 7163^2 .

It is not a de Polignac number, because 61651225 - 2⁵ = 61651193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61651193 and 61651202.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1233000 + ... + 1233049.

Almost surely, 2^61651225 is an apocalyptic number.

It is an amenable number.

61651225 is a deficient number, since it is larger than the sum of its proper divisors (14796325).

61651225 is a wasteful number, since it uses less digits than its factorization.

61651225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466059 (or 2466054 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 61651225 is about 7851.8294046674. The cubic root of 61651225 is about 395.0456070824.

The spelling of 61651225 in words is "sixty-one million, six hundred fifty-one thousand, two hundred twenty-five".