397551687289 has 9 divisors (see below), whose sum is σ = 408610701261. Its totient is φ = 386784348480.

The previous prime is 397551687277. The next prime is 397551687331. The reversal of 397551687289 is 982786155793.

The square root of 397551687289 is 630517.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 256557445225 + 140994242064 = 506515^2 + 375492^2 .

It is a de Polignac number, because none of the positive numbers 2^k-397551687289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397551687089) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23320609 + ... + 23337649.

It is an arithmetic number, because the mean of its divisors is an integer number (45401189029).

Almost surely, 2^397551687289 is an apocalyptic number.

397551687289 is the 630517-th square number.

397551687289 is the 315259-th centered octagonal number.

It is an amenable number.

397551687289 is a deficient number, since it is larger than the sum of its proper divisors (11059013972).

397551687289 is an frugal number, since it uses more digits than its factorization.

397551687289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34156 (or 17078 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 70.

The spelling of 397551687289 in words is "three hundred ninety-seven billion, five hundred fifty-one million, six hundred eighty-seven thousand, two hundred eighty-nine".