97881779 has 2 divisors, whose sum is σ = 97881780. Its totient is φ = 97881778.

The previous prime is 97881769. The next prime is 97881829. The reversal of 97881779 is 97718879.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97881779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97881739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48940889 + 48940890.

It is an arithmetic number, because the mean of its divisors is an integer number (48940890).

Almost surely, 2^97881779 is an apocalyptic number.

97881779 is a deficient number, since it is larger than the sum of its proper divisors (1).

97881779 is an equidigital number, since it uses as much as digits as its factorization.

97881779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 56.

The square root of 97881779 is about 9893.5220725483. The cubic root of 97881779 is about 460.8581633190.

The spelling of 97881779 in words is "ninety-seven million, eight hundred eighty-one thousand, seven hundred seventy-nine".