49123781 has 8 divisors (see below), whose sum is σ = 57511104. Its totient is φ = 41078880.

The previous prime is 49123771. The next prime is 49123783. The reversal of 49123781 is 18732194.

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 49123781 - 2⁶ = 49123717 is a prime.

It is a super-2 number, since 2×49123781² = 4826291719471922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49123783) 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, 85295 + ... + 85868.

It is an arithmetic number, because the mean of its divisors is an integer number (7188888).

Almost surely, 2^49123781 is an apocalyptic number.

49123781 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

49123781 is a deficient number, since it is larger than the sum of its proper divisors (8387323).

49123781 is a wasteful number, since it uses less digits than its factorization.

49123781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171211.

The product of its digits is 12096, while the sum is 35.

The square root of 49123781 is about 7008.8359233185. The cubic root of 49123781 is about 366.2384428709.

The spelling of 49123781 in words is "forty-nine million, one hundred twenty-three thousand, seven hundred eighty-one".