721875841 has 2 divisors, whose sum is σ = 721875842. Its totient is φ = 721875840.

The previous prime is 721875799. The next prime is 721875863. The reversal of 721875841 is 148578127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533610000 + 188265841 = 23100^2 + 13721^2 .

It is a cyclic number.

It is not a de Polignac number, because 721875841 - 2²³ = 713487233 is a prime.

It is a super-2 number, since 2×721875841² = 1042209459638914562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721875871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360937920 + 360937921.

It is an arithmetic number, because the mean of its divisors is an integer number (360937921).

Almost surely, 2^721875841 is an apocalyptic number.

It is an amenable number.

721875841 is a deficient number, since it is larger than the sum of its proper divisors (1).

721875841 is an equidigital number, since it uses as much as digits as its factorization.

721875841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 43.

The square root of 721875841 is about 26867.7472259957. The cubic root of 721875841 is about 897.0586449422.

The spelling of 721875841 in words is "seven hundred twenty-one million, eight hundred seventy-five thousand, eight hundred forty-one".