397440051551 has 2 divisors, whose sum is σ = 397440051552. Its totient is φ = 397440051550.

The previous prime is 397440051539. The next prime is 397440051583. The reversal of 397440051551 is 155150044793.

It is a weak prime.

It is an emirp because it is prime and its reverse (155150044793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397440051551 - 2³⁰ = 396366309727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397440051511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198720025775 + 198720025776.

It is an arithmetic number, because the mean of its divisors is an integer number (198720025776).

Almost surely, 2^397440051551 is an apocalyptic number.

397440051551 is a deficient number, since it is larger than the sum of its proper divisors (1).

397440051551 is an equidigital number, since it uses as much as digits as its factorization.

397440051551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 397440051551 in words is "three hundred ninety-seven billion, four hundred forty million, fifty-one thousand, five hundred fifty-one".