97651999 has 2 divisors, whose sum is σ = 97652000. Its totient is φ = 97651998.

The previous prime is 97651993. The next prime is 97652053. The reversal of 97651999 is 99915679.

It is a weak prime.

It is an emirp because it is prime and its reverse (99915679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97651999 - 2⁷ = 97651871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97651993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48825999 + 48826000.

It is an arithmetic number, because the mean of its divisors is an integer number (48826000).

Almost surely, 2^97651999 is an apocalyptic number.

97651999 is a deficient number, since it is larger than the sum of its proper divisors (1).

97651999 is an equidigital number, since it uses as much as digits as its factorization.

97651999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 55.

The square root of 97651999 is about 9881.9026002081. The cubic root of 97651999 is about 460.4972552841.

It can be divided in two parts, 976 and 51999, that added together give a triangular number (52975 = T₃₂₅).

The spelling of 97651999 in words is "ninety-seven million, six hundred fifty-one thousand, nine hundred ninety-nine".