2154197246939 has 2 divisors, whose sum is σ = 2154197246940. Its totient is φ = 2154197246938.

The previous prime is 2154197246933. The next prime is 2154197246959. The reversal of 2154197246939 is 9396427914512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154197246939 - 2²⁸ = 2153928811483 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154197246933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077098623469 + 1077098623470.

It is an arithmetic number, because the mean of its divisors is an integer number (1077098623470).

Almost surely, 2^{2154197246939} is an apocalyptic number.

2154197246939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154197246939 is an equidigital number, since it uses as much as digits as its factorization.

2154197246939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 62.

The spelling of 2154197246939 in words is "two trillion, one hundred fifty-four billion, one hundred ninety-seven million, two hundred forty-six thousand, nine hundred thirty-nine".