2251437427081 has 4 divisors (see below), whose sum is σ = 2251442704000. Its totient is φ = 2251432150164.

The previous prime is 2251437427073. The next prime is 2251437427097. The reversal of 2251437427081 is 1807247341522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2251437427081 - 2³ = 2251437427073 is a prime.

It is a super-2 number, since 2×2251437427081² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251437427021) 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, 1936161 + ... + 2872558.

It is an arithmetic number, because the mean of its divisors is an integer number (562860676000).

Almost surely, 2^{2251437427081} is an apocalyptic number.

It is an amenable number.

2251437427081 is a deficient number, since it is larger than the sum of its proper divisors (5276919).

2251437427081 is an equidigital number, since it uses as much as digits as its factorization.

2251437427081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276918.

The product of its (nonzero) digits is 752640, while the sum is 46.

The spelling of 2251437427081 in words is "two trillion, two hundred fifty-one billion, four hundred thirty-seven million, four hundred twenty-seven thousand, eighty-one".