49165581 has 16 divisors (see below), whose sum is σ = 69552000. Its totient is φ = 30786048.

The previous prime is 49165577. The next prime is 49165591. The reversal of 49165581 is 18556194.

It is not a de Polignac number, because 49165581 - 2² = 49165577 is a prime.

It is a super-2 number, since 2×49165581² = 4834508710135122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49165511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46345 + ... + 47393.

It is an arithmetic number, because the mean of its divisors is an integer number (4347000).

Almost surely, 2^49165581 is an apocalyptic number.

It is an amenable number.

49165581 is a deficient number, since it is larger than the sum of its proper divisors (20386419).

49165581 is a wasteful number, since it uses less digits than its factorization.

49165581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988.

The product of its digits is 43200, while the sum is 39.

The square root of 49165581 is about 7011.8172394893. The cubic root of 49165581 is about 366.3422922796.

The spelling of 49165581 in words is "forty-nine million, one hundred sixty-five thousand, five hundred eighty-one".