1205523551431 has 4 divisors (see below), whose sum is σ = 1225286232664. Its totient is φ = 1185760870200.

The previous prime is 1205523551423. The next prime is 1205523551437. The reversal of 1205523551431 is 1341553255021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205523551431 - 2³ = 1205523551423 is a prime.

It is a super-2 number, since 2×1205523551431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205523551437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9881340525 + ... + 9881340646.

It is an arithmetic number, because the mean of its divisors is an integer number (306321558166).

Almost surely, 2^{1205523551431} is an apocalyptic number.

1205523551431 is a deficient number, since it is larger than the sum of its proper divisors (19762681233).

1205523551431 is an equidigital number, since it uses as much as digits as its factorization.

1205523551431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19762681232.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 1205523551431 in words is "one trillion, two hundred five billion, five hundred twenty-three million, five hundred fifty-one thousand, four hundred thirty-one".