402138761291 has 2 divisors, whose sum is σ = 402138761292. Its totient is φ = 402138761290.

The previous prime is 402138761257. The next prime is 402138761359. The reversal of 402138761291 is 192167831204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402138761291 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (402138761231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201069380645 + 201069380646.

It is an arithmetic number, because the mean of its divisors is an integer number (201069380646).

Almost surely, 2^402138761291 is an apocalyptic number.

402138761291 is a deficient number, since it is larger than the sum of its proper divisors (1).

402138761291 is an equidigital number, since it uses as much as digits as its factorization.

402138761291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 402138761291 in words is "four hundred two billion, one hundred thirty-eight million, seven hundred sixty-one thousand, two hundred ninety-one".