523400897503409 has 2 divisors, whose sum is σ = 523400897503410. Its totient is φ = 523400897503408.

The previous prime is 523400897503399. The next prime is 523400897503411. The reversal of 523400897503409 is 904305798004325.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520997606938384 + 2403290565025 = 22825372^2 + 1550255^2 .

It is a cyclic number.

It is not a de Polignac number, because 523400897503409 - 2³⁶ = 523332178026673 is a prime.

It is a super-3 number, since 3×523400897503409³ (a number of 45 digits) contains 333 as substring.

Together with 523400897503411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (523400897503499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261700448751704 + 261700448751705.

It is an arithmetic number, because the mean of its divisors is an integer number (261700448751705).

Almost surely, 2^{523400897503409} is an apocalyptic number.

It is an amenable number.

523400897503409 is a deficient number, since it is larger than the sum of its proper divisors (1).

523400897503409 is an equidigital number, since it uses as much as digits as its factorization.

523400897503409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32659200, while the sum is 59.

The spelling of 523400897503409 in words is "five hundred twenty-three trillion, four hundred billion, eight hundred ninety-seven million, five hundred three thousand, four hundred nine".