745651 has 4 divisors (see below), whose sum is σ = 747400. Its totient is φ = 743904.

The previous prime is 745649. The next prime is 745673. The reversal of 745651 is 156547.

745651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156547 = 37 ⋅4231.

It is a cyclic number.

It is not a de Polignac number, because 745651 - 2¹ = 745649 is a prime.

It is a Duffinian number.

745651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (745601) 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, 235 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (186850).

2⁷⁴⁵⁶⁵¹ is an apocalyptic number.

745651 is a deficient number, since it is larger than the sum of its proper divisors (1749).

745651 is a wasteful number, since it uses less digits than its factorization.

745651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748.

The product of its digits is 4200, while the sum is 28.

The square root of 745651 is about 863.5108569092. The cubic root of 745651 is about 90.6800744901.

The spelling of 745651 in words is "seven hundred forty-five thousand, six hundred fifty-one".