2621357881 has 2 divisors, whose sum is σ = 2621357882. Its totient is φ = 2621357880.

The previous prime is 2621357807. The next prime is 2621357903. The reversal of 2621357881 is 1887531262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2568867856 + 52490025 = 50684^2 + 7245^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621357881 - 2²¹ = 2619260729 is a prime.

It is a super-2 number, since 2×2621357881² = 13743034280561620322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2621357281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310678940 + 1310678941.

It is an arithmetic number, because the mean of its divisors is an integer number (1310678941).

Almost surely, 2^2621357881 is an apocalyptic number.

It is an amenable number.

2621357881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621357881 is an equidigital number, since it uses as much as digits as its factorization.

2621357881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 2621357881 is about 51199.1980503601. The cubic root of 2621357881 is about 1378.8238036818.

The spelling of 2621357881 in words is "two billion, six hundred twenty-one million, three hundred fifty-seven thousand, eight hundred eighty-one".