2581249207 has 4 divisors (see below), whose sum is σ = 2581380136. Its totient is φ = 2581118280.

The previous prime is 2581249171. The next prime is 2581249217. The reversal of 2581249207 is 7029421852.

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 2581249207 - 2¹⁵ = 2581216439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2581249207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581249217) 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, 29193 + ... + 77554.

It is an arithmetic number, because the mean of its divisors is an integer number (645345034).

Almost surely, 2^2581249207 is an apocalyptic number.

2581249207 is a deficient number, since it is larger than the sum of its proper divisors (130929).

2581249207 is a wasteful number, since it uses less digits than its factorization.

2581249207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130928.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 2581249207 is about 50805.9957780575. The cubic root of 2581249207 is about 1371.7552948010.

The spelling of 2581249207 in words is "two billion, five hundred eighty-one million, two hundred forty-nine thousand, two hundred seven".