73251421 has 2 divisors, whose sum is σ = 73251422. Its totient is φ = 73251420.

The previous prime is 73251341. The next prime is 73251433. The reversal of 73251421 is 12415237.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 7868025 = 8086^2 + 2805^2 .

It is an emirp because it is prime and its reverse (12415237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73251421 - 2¹³ = 73243229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73251221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36625710 + 36625711.

It is an arithmetic number, because the mean of its divisors is an integer number (36625711).

Almost surely, 2^73251421 is an apocalyptic number.

It is an amenable number.

73251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73251421 is an equidigital number, since it uses as much as digits as its factorization.

73251421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 73251421 is about 8558.7043996156. The cubic root of 73251421 is about 418.4131751686.

Adding to 73251421 its reverse (12415237), we get a palindrome (85666658).

The spelling of 73251421 in words is "seventy-three million, two hundred fifty-one thousand, four hundred twenty-one".