61651057 has 8 divisors (see below), whose sum is σ = 66456936. Its totient is φ = 56854272.

The previous prime is 61651049. The next prime is 61651069. The reversal of 61651057 is 75015616.

It can be written as a sum of positive squares in 4 ways, for example, as 6431296 + 55219761 = 2536^2 + 7431^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61651057 - 2³ = 61651049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61651757) 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, 19833 + ... + 22729.

It is an arithmetic number, because the mean of its divisors is an integer number (8307117).

Almost surely, 2^61651057 is an apocalyptic number.

It is an amenable number.

61651057 is a deficient number, since it is larger than the sum of its proper divisors (4805879).

61651057 is a wasteful number, since it uses less digits than its factorization.

61651057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 61651057 is about 7851.8187065163. The cubic root of 61651057 is about 395.0452482481.

The spelling of 61651057 in words is "sixty-one million, six hundred fifty-one thousand, fifty-seven".