73151861 has 2 divisors, whose sum is σ = 73151862. Its totient is φ = 73151860.

The previous prime is 73151809. The next prime is 73151863. The reversal of 73151861 is 16815137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49434961 + 23716900 = 7031^2 + 4870^2 .

It is an emirp because it is prime and its reverse (16815137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73151861 - 2²² = 68957557 is a prime.

Together with 73151863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73151863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36575930 + 36575931.

It is an arithmetic number, because the mean of its divisors is an integer number (36575931).

Almost surely, 2^73151861 is an apocalyptic number.

It is an amenable number.

73151861 is a deficient number, since it is larger than the sum of its proper divisors (1).

73151861 is an equidigital number, since it uses as much as digits as its factorization.

73151861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 73151861 is about 8552.8861210705. The cubic root of 73151861 is about 418.2235265025.

Adding to 73151861 its reverse (16815137), we get a palindrome (89966998).

The spelling of 73151861 in words is "seventy-three million, one hundred fifty-one thousand, eight hundred sixty-one".