49691661 has 16 divisors (see below), whose sum is σ = 69373824. Its totient is φ = 31578624.

The previous prime is 49691659. The next prime is 49691701. The reversal of 49691661 is 16619694.

It is not a de Polignac number, because 49691661 - 2¹ = 49691659 is a prime.

It is a super-2 number, since 2×49691661² = 4938522345877842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49691261) 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, 22185 + ... + 24321.

It is an arithmetic number, because the mean of its divisors is an integer number (4335864).

Almost surely, 2^49691661 is an apocalyptic number.

It is an amenable number.

49691661 is a deficient number, since it is larger than the sum of its proper divisors (19682163).

49691661 is a wasteful number, since it uses less digits than its factorization.

49691661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its digits is 69984, while the sum is 42.

The square root of 49691661 is about 7049.2312346808. The cubic root of 49691661 is about 367.6443007758.

The spelling of 49691661 in words is "forty-nine million, six hundred ninety-one thousand, six hundred sixty-one".