72146869 has 2 divisors, whose sum is σ = 72146870. Its totient is φ = 72146868.

The previous prime is 72146807. The next prime is 72146881. The reversal of 72146869 is 96864127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63520900 + 8625969 = 7970^2 + 2937^2 .

It is a cyclic number.

It is not a de Polignac number, because 72146869 - 2⁷ = 72146741 is a prime.

It is a super-2 number, since 2×72146869² = 10410341413006322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72144869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36073434 + 36073435.

It is an arithmetic number, because the mean of its divisors is an integer number (36073435).

Almost surely, 2^72146869 is an apocalyptic number.

It is an amenable number.

72146869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72146869 is an equidigital number, since it uses as much as digits as its factorization.

72146869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 72146869 is about 8493.9313041724. The cubic root of 72146869 is about 416.2994427046.

The spelling of 72146869 in words is "seventy-two million, one hundred forty-six thousand, eight hundred sixty-nine".