61651009 has 8 divisors (see below), whose sum is σ = 70701120. Its totient is φ = 52661616.

The previous prime is 61650997. The next prime is 61651019. The reversal of 61651009 is 90015616.

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

It is not a de Polignac number, because 61651009 - 2⁵ = 61650977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61651019) 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, 12979 + ... + 17080.

It is an arithmetic number, because the mean of its divisors is an integer number (8837640).

Almost surely, 2^61651009 is an apocalyptic number.

It is an amenable number.

61651009 is a deficient number, since it is larger than the sum of its proper divisors (9050111).

61651009 is a wasteful number, since it uses less digits than its factorization.

61651009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30359.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 61651009 is about 7851.8156498991. The cubic root of 61651009 is about 395.0451457239.

The spelling of 61651009 in words is "sixty-one million, six hundred fifty-one thousand, nine".