5651551 has 4 divisors (see below), whose sum is σ = 5747400. Its totient is φ = 5555704.

The previous prime is 5651539. The next prime is 5651557. The reversal of 5651551 is 1551565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551565 = 5 ⋅310313.

It is a cyclic number.

It is not a de Polignac number, because 5651551 - 2⁵ = 5651519 is a prime.

It is a Duffinian number.

5651551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651557) 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, 47836 + ... + 47953.

It is an arithmetic number, because the mean of its divisors is an integer number (1436850).

Almost surely, 2^5651551 is an apocalyptic number.

5651551 is a deficient number, since it is larger than the sum of its proper divisors (95849).

5651551 is an equidigital number, since it uses as much as digits as its factorization.

5651551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95848.

The product of its digits is 3750, while the sum is 28.

The square root of 5651551 is about 2377.2990977157. The cubic root of 5651551 is about 178.1240455884.

It can be divided in two parts, 565 and 1551, that added together give a square (2116 = 46²).

The spelling of 5651551 in words is "five million, six hundred fifty-one thousand, five hundred fifty-one".