73891261 has 2 divisors, whose sum is σ = 73891262. Its totient is φ = 73891260.

The previous prime is 73891253. The next prime is 73891277. The reversal of 73891261 is 16219837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57851236 + 16040025 = 7606^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 73891261 - 2³ = 73891253 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73891261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73891291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36945630 + 36945631.

It is an arithmetic number, because the mean of its divisors is an integer number (36945631).

Almost surely, 2^73891261 is an apocalyptic number.

It is an amenable number.

73891261 is a deficient number, since it is larger than the sum of its proper divisors (1).

73891261 is an equidigital number, since it uses as much as digits as its factorization.

73891261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 73891261 is about 8596.0026174961. The cubic root of 73891261 is about 419.6279036231.

The spelling of 73891261 in words is "seventy-three million, eight hundred ninety-one thousand, two hundred sixty-one".