72821951 has 2 divisors, whose sum is σ = 72821952. Its totient is φ = 72821950.

The previous prime is 72821923. The next prime is 72821971. The reversal of 72821951 is 15912827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72821951 - 2¹⁴ = 72805567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72821971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36410975 + 36410976.

It is an arithmetic number, because the mean of its divisors is an integer number (36410976).

Almost surely, 2^72821951 is an apocalyptic number.

72821951 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821951 is an equidigital number, since it uses as much as digits as its factorization.

72821951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 72821951 is about 8533.5778545696. The cubic root of 72821951 is about 417.5938589222.

The spelling of 72821951 in words is "seventy-two million, eight hundred twenty-one thousand, nine hundred fifty-one".