745172551 has 4 divisors (see below), whose sum is σ = 745420000. Its totient is φ = 744925104.

The previous prime is 745172531. The next prime is 745172579. The reversal of 745172551 is 155271547.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 745172551 - 2²⁵ = 711618119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 745172551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745172531) 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, 119151 + ... + 125248.

It is an arithmetic number, because the mean of its divisors is an integer number (186355000).

Almost surely, 2^745172551 is an apocalyptic number.

745172551 is a deficient number, since it is larger than the sum of its proper divisors (247449).

745172551 is a wasteful number, since it uses less digits than its factorization.

745172551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247448.

The product of its digits is 49000, while the sum is 37.

The square root of 745172551 is about 27297.8488346609. The cubic root of 745172551 is about 906.6067530124.

The spelling of 745172551 in words is "seven hundred forty-five million, one hundred seventy-two thousand, five hundred fifty-one".