4951781 has 4 divisors (see below), whose sum is σ = 4964652. Its totient is φ = 4938912.

The previous prime is 4951757. The next prime is 4951783. The reversal of 4951781 is 1871594.

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 3389281 + 1562500 = 1841^2 + 1250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4951781 is a prime.

It is a super-2 number, since 2×4951781² = 49040270143922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4951783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5840 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (1241163).

Almost surely, 2^4951781 is an apocalyptic number.

It is an amenable number.

4951781 is a deficient number, since it is larger than the sum of its proper divisors (12871).

4951781 is a wasteful number, since it uses less digits than its factorization.

4951781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870.

The product of its digits is 10080, while the sum is 35.

The square root of 4951781 is about 2225.2597601179. The cubic root of 4951781 is about 170.4461292416.

The spelling of 4951781 in words is "four million, nine hundred fifty-one thousand, seven hundred eighty-one".