981281251 has 4 divisors (see below), whose sum is σ = 981403600. Its totient is φ = 981158904.

The previous prime is 981281233. The next prime is 981281261. The reversal of 981281251 is 152182189.

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 981281251 - 2¹⁷ = 981150179 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 981281251.

It is not an unprimeable number, because it can be changed into a prime (981281261) 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, 48231 + ... + 65488.

It is an arithmetic number, because the mean of its divisors is an integer number (245350900).

Almost surely, 2^981281251 is an apocalyptic number.

981281251 is a deficient number, since it is larger than the sum of its proper divisors (122349).

981281251 is a wasteful number, since it uses less digits than its factorization.

981281251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122348.

The product of its digits is 11520, while the sum is 37.

The square root of 981281251 is about 31325.4090316471. The cubic root of 981281251 is about 993.7210746113.

The spelling of 981281251 in words is "nine hundred eighty-one million, two hundred eighty-one thousand, two hundred fifty-one".