5191661 has 4 divisors (see below), whose sum is σ = 5231424. Its totient is φ = 5151900.

The previous prime is 5191651. The next prime is 5191673. The reversal of 5191661 is 1661915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5191661 - 2⁶ = 5191597 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 (5191651) 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, 19685 + ... + 19946.

It is an arithmetic number, because the mean of its divisors is an integer number (1307856).

Almost surely, 2^5191661 is an apocalyptic number.

It is an amenable number.

5191661 is a deficient number, since it is larger than the sum of its proper divisors (39763).

5191661 is a wasteful number, since it uses less digits than its factorization.

5191661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39762.

The product of its digits is 1620, while the sum is 29.

The square root of 5191661 is about 2278.5216698553. The cubic root of 5191661 is about 173.1551616745.

The spelling of 5191661 in words is "five million, one hundred ninety-one thousand, six hundred sixty-one".