2780012251 has 4 divisors (see below), whose sum is σ = 2780166312. Its totient is φ = 2779858192.

The previous prime is 2780012167. The next prime is 2780012267. The reversal of 2780012251 is 1522100872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2780012251 - 2⁹ = 2780011739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780012281) 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, 45721 + ... + 87466.

It is an arithmetic number, because the mean of its divisors is an integer number (695041578).

Almost surely, 2^2780012251 is an apocalyptic number.

2780012251 is a deficient number, since it is larger than the sum of its proper divisors (154061).

2780012251 is a wasteful number, since it uses less digits than its factorization.

2780012251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154060.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 2780012251 is about 52725.8214824577. The cubic root of 2780012251 is about 1406.0979333549.

The spelling of 2780012251 in words is "two billion, seven hundred eighty million, twelve thousand, two hundred fifty-one".