97511551 has 2 divisors, whose sum is σ = 97511552. Its totient is φ = 97511550.

The previous prime is 97511549. The next prime is 97511563. The reversal of 97511551 is 15511579.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97511551 - 2¹ = 97511549 is a prime.

Together with 97511549, 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 (97511501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48755775 + 48755776.

It is an arithmetic number, because the mean of its divisors is an integer number (48755776).

Almost surely, 2^97511551 is an apocalyptic number.

97511551 is a deficient number, since it is larger than the sum of its proper divisors (1).

97511551 is an equidigital number, since it uses as much as digits as its factorization.

97511551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 97511551 is about 9874.7937193645. The cubic root of 97511551 is about 460.2763792799.

The spelling of 97511551 in words is "ninety-seven million, five hundred eleven thousand, five hundred fifty-one".