751425221 has 2 divisors, whose sum is σ = 751425222. Its totient is φ = 751425220.

The previous prime is 751425139. The next prime is 751425247. The reversal of 751425221 is 122524157.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 729756196 + 21669025 = 27014^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 751425221 - 2¹⁰ = 751424197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (751425251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 375712610 + 375712611.

It is an arithmetic number, because the mean of its divisors is an integer number (375712611).

Almost surely, 2^751425221 is an apocalyptic number.

It is an amenable number.

751425221 is a deficient number, since it is larger than the sum of its proper divisors (1).

751425221 is an equidigital number, since it uses as much as digits as its factorization.

751425221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 29.

The square root of 751425221 is about 27412.1363815373. The cubic root of 751425221 is about 909.1354430156.

Adding to 751425221 its reverse (122524157), we get a palindrome (873949378).

The spelling of 751425221 in words is "seven hundred fifty-one million, four hundred twenty-five thousand, two hundred twenty-one".