72154309 has 2 divisors, whose sum is σ = 72154310. Its totient is φ = 72154308.

The previous prime is 72154297. The next prime is 72154351. The reversal of 72154309 is 90345127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68525284 + 3629025 = 8278^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 72154309 - 2¹³ = 72146117 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 (72154009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36077154 + 36077155.

It is an arithmetic number, because the mean of its divisors is an integer number (36077155).

Almost surely, 2^72154309 is an apocalyptic number.

It is an amenable number.

72154309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72154309 is an equidigital number, since it uses as much as digits as its factorization.

72154309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 72154309 is about 8494.3692526285. The cubic root of 72154309 is about 416.3137522255.

The spelling of 72154309 in words is "seventy-two million, one hundred fifty-four thousand, three hundred nine".