49165021 has 4 divisors (see below), whose sum is σ = 49478332. Its totient is φ = 48851712.

The previous prime is 49165001. The next prime is 49165031. The reversal of 49165021 is 12056194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12056194 = 2 ⋅6028097.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 44368921 = 2190^2 + 6661^2 .

It is a cyclic number.

It is not a de Polignac number, because 49165021 - 2⁷ = 49164893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49165001) 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, 156420 + ... + 156733.

It is an arithmetic number, because the mean of its divisors is an integer number (12369583).

Almost surely, 2^49165021 is an apocalyptic number.

It is an amenable number.

49165021 is a deficient number, since it is larger than the sum of its proper divisors (313311).

49165021 is a wasteful number, since it uses less digits than its factorization.

49165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313310.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 49165021 is about 7011.7773067889. Note that the first 3 decimals coincide. The cubic root of 49165021 is about 366.3409013847.

The spelling of 49165021 in words is "forty-nine million, one hundred sixty-five thousand, twenty-one".