97772551 has 2 divisors, whose sum is σ = 97772552. Its totient is φ = 97772550.

The previous prime is 97772527. The next prime is 97772561. The reversal of 97772551 is 15527779.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97772551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 97772498 and 97772507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97772501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48886275 + 48886276.

It is an arithmetic number, because the mean of its divisors is an integer number (48886276).

Almost surely, 2^97772551 is an apocalyptic number.

97772551 is a deficient number, since it is larger than the sum of its proper divisors (1).

97772551 is an equidigital number, since it uses as much as digits as its factorization.

97772551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154350, while the sum is 43.

The square root of 97772551 is about 9888.0003539644. Note that the first 3 decimals coincide. The cubic root of 97772551 is about 460.6866729348.

The spelling of 97772551 in words is "ninety-seven million, seven hundred seventy-two thousand, five hundred fifty-one".