725021191 has 2 divisors, whose sum is σ = 725021192. Its totient is φ = 725021190.

The previous prime is 725021147. The next prime is 725021197. The reversal of 725021191 is 191120527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 725021191 - 2²³ = 716632583 is a prime.

It is a super-3 number, since 3×725021191³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725021197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362510595 + 362510596.

It is an arithmetic number, because the mean of its divisors is an integer number (362510596).

Almost surely, 2^725021191 is an apocalyptic number.

725021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

725021191 is an equidigital number, since it uses as much as digits as its factorization.

725021191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 725021191 is about 26926.2175397882. The cubic root of 725021191 is about 898.3596421086.

It can be divided in two parts, 7250 and 21191, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 725021191 in words is "seven hundred twenty-five million, twenty-one thousand, one hundred ninety-one".