745642251 has 18 divisors (see below), whose sum is σ = 1136713500. Its totient is φ = 470929896.

The previous prime is 745642243. The next prime is 745642301. The reversal of 745642251 is 152246547.

It is a happy number.

745642251 is a `hidden beast` number, since 7 + 4 + 5 + 642 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 745642251 - 2³ = 745642243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (745640251) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 111501 + ... + 117998.

It is an arithmetic number, because the mean of its divisors is an integer number (63150750).

Almost surely, 2^745642251 is an apocalyptic number.

745642251 is a deficient number, since it is larger than the sum of its proper divisors (391071249).

745642251 is a wasteful number, since it uses less digits than its factorization.

745642251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229543 (or 229521 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 745642251 is about 27306.4507213955. The cubic root of 745642251 is about 906.7971982776.

Adding to 745642251 its reverse (152246547), we get a palindrome (897888798).

The spelling of 745642251 in words is "seven hundred forty-five million, six hundred forty-two thousand, two hundred fifty-one".