61842257 has 4 divisors (see below), whose sum is σ = 61891236. Its totient is φ = 61793280.

The previous prime is 61842223. The next prime is 61842289. The reversal of 61842257 is 75224816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42823936 + 19018321 = 6544^2 + 4361^2 .

It is a cyclic number.

It is not a de Polignac number, because 61842257 - 2¹⁶ = 61776721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61842217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22544 + ... + 25137.

It is an arithmetic number, because the mean of its divisors is an integer number (15472809).

Almost surely, 2^61842257 is an apocalyptic number.

It is an amenable number.

61842257 is a deficient number, since it is larger than the sum of its proper divisors (48979).

61842257 is a wasteful number, since it uses less digits than its factorization.

61842257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48978.

The product of its digits is 26880, while the sum is 35.

The square root of 61842257 is about 7863.9848041562. The cubic root of 61842257 is about 395.4532147703.

It can be divided in two parts, 618 and 42257, that added together give a cube (42875 = 35³).

The spelling of 61842257 in words is "sixty-one million, eight hundred forty-two thousand, two hundred fifty-seven".