97213639 has 2 divisors, whose sum is σ = 97213640. Its totient is φ = 97213638.

The previous prime is 97213637. The next prime is 97213643. The reversal of 97213639 is 93631279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97213639 - 2¹ = 97213637 is a prime.

Together with 97213637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97213631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48606819 + 48606820.

It is an arithmetic number, because the mean of its divisors is an integer number (48606820).

Almost surely, 2^97213639 is an apocalyptic number.

97213639 is a deficient number, since it is larger than the sum of its proper divisors (1).

97213639 is an equidigital number, since it uses as much as digits as its factorization.

97213639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 40.

The square root of 97213639 is about 9859.6977134190. The cubic root of 97213639 is about 459.8071639743.

The spelling of 97213639 in words is "ninety-seven million, two hundred thirteen thousand, six hundred thirty-nine".