31355060621 has 2 divisors, whose sum is σ = 31355060622. Its totient is φ = 31355060620.

The previous prime is 31355060587. The next prime is 31355060647. The reversal of 31355060621 is 12606055313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20603444521 + 10751616100 = 143539^2 + 103690^2 .

It is an emirp because it is prime and its reverse (12606055313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31355060621 - 2⁶ = 31355060557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31355062621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15677530310 + 15677530311.

It is an arithmetic number, because the mean of its divisors is an integer number (15677530311).

Almost surely, 2^31355060621 is an apocalyptic number.

It is an amenable number.

31355060621 is a deficient number, since it is larger than the sum of its proper divisors (1).

31355060621 is an equidigital number, since it uses as much as digits as its factorization.

31355060621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 31355060621 in words is "thirty-one billion, three hundred fifty-five million, sixty thousand, six hundred twenty-one".