97971407 has 2 divisors, whose sum is σ = 97971408. Its totient is φ = 97971406.

The previous prime is 97971403. The next prime is 97971443. The reversal of 97971407 is 70417979.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70417979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97971407 - 2² = 97971403 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97971403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48985703 + 48985704.

It is an arithmetic number, because the mean of its divisors is an integer number (48985704).

Almost surely, 2^97971407 is an apocalyptic number.

97971407 is a deficient number, since it is larger than the sum of its proper divisors (1).

97971407 is an equidigital number, since it uses as much as digits as its factorization.

97971407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 97971407 is about 9898.0506666717. The cubic root of 97971407 is about 460.9987859991.

The spelling of 97971407 in words is "ninety-seven million, nine hundred seventy-one thousand, four hundred seven".