1621155652031 has 2 divisors, whose sum is σ = 1621155652032. Its totient is φ = 1621155652030.

The previous prime is 1621155651961. The next prime is 1621155652033. The reversal of 1621155652031 is 1302565511261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621155652031 - 2¹⁰ = 1621155651007 is a prime.

It is a super-2 number, since 2×1621155652031² (a number of 25 digits) contains 22 as substring.

Together with 1621155652033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621155652033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810577826015 + 810577826016.

It is an arithmetic number, because the mean of its divisors is an integer number (810577826016).

Almost surely, 2^{1621155652031} is an apocalyptic number.

1621155652031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621155652031 is an equidigital number, since it uses as much as digits as its factorization.

1621155652031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 1621155652031 in words is "one trillion, six hundred twenty-one billion, one hundred fifty-five million, six hundred fifty-two thousand, thirty-one".