531612265421 has 2 divisors, whose sum is σ = 531612265422. Its totient is φ = 531612265420.

The previous prime is 531612265367. The next prime is 531612265433. The reversal of 531612265421 is 124562216135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529416312100 + 2195953321 = 727610^2 + 46861^2 .

It is a cyclic number.

It is not a de Polignac number, because 531612265421 - 2²² = 531608071117 is a prime.

It is a super-2 number, since 2×531612265421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531612265021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265806132710 + 265806132711.

It is an arithmetic number, because the mean of its divisors is an integer number (265806132711).

Almost surely, 2^531612265421 is an apocalyptic number.

It is an amenable number.

531612265421 is a deficient number, since it is larger than the sum of its proper divisors (1).

531612265421 is an equidigital number, since it uses as much as digits as its factorization.

531612265421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The spelling of 531612265421 in words is "five hundred thirty-one billion, six hundred twelve million, two hundred sixty-five thousand, four hundred twenty-one".