49097981 has 4 divisors (see below), whose sum is σ = 50024412. Its totient is φ = 48171552.

The previous prime is 49097977. The next prime is 49097987. The reversal of 49097981 is 18979094.

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 30349081 + 18748900 = 5509^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 49097981 - 2² = 49097977 is a prime.

It is a super-2 number, since 2×49097981² = 4821223476552722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49097987) 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 3 ways as a sum of consecutive naturals, for example, 463136 + ... + 463241.

It is an arithmetic number, because the mean of its divisors is an integer number (12506103).

Almost surely, 2^49097981 is an apocalyptic number.

It is an amenable number.

49097981 is a deficient number, since it is larger than the sum of its proper divisors (926431).

49097981 is an equidigital number, since it uses as much as digits as its factorization.

49097981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926430.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 49097981 is about 7006.9951477078. The cubic root of 49097981 is about 366.1743150268.

The spelling of 49097981 in words is "forty-nine million, ninety-seven thousand, nine hundred eighty-one".