61851257 has 8 divisors (see below), whose sum is σ = 67119360. Its totient is φ = 56656080.

The previous prime is 61851239. The next prime is 61851263. The reversal of 61851257 is 75215816.

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

It is not a de Polignac number, because 61851257 - 2¹⁶ = 61785721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61851277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16457 + ... + 19862.

It is an arithmetic number, because the mean of its divisors is an integer number (8389920).

Almost surely, 2^61851257 is an apocalyptic number.

It is an amenable number.

61851257 is a deficient number, since it is larger than the sum of its proper divisors (5268103).

61851257 is a wasteful number, since it uses less digits than its factorization.

61851257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36463.

The product of its digits is 16800, while the sum is 35.

The square root of 61851257 is about 7864.5570123180. The cubic root of 61851257 is about 395.4723974806.

The spelling of 61851257 in words is "sixty-one million, eight hundred fifty-one thousand, two hundred fifty-seven".