251833961 has 6 divisors (see below), whose sum is σ = 265786362. Its totient is φ = 238579200.

The previous prime is 251833957. The next prime is 251833973. The reversal of 251833961 is 169338152.

It is a happy number.

251833961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 130393561 + 121440400 = 11419^2 + 11020^2 .

It is not a de Polignac number, because 251833961 - 2² = 251833957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251833921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 348440 + ... + 349161.

It is an arithmetic number, because the mean of its divisors is an integer number (44297727).

Almost surely, 2^251833961 is an apocalyptic number.

It is an amenable number.

251833961 is a deficient number, since it is larger than the sum of its proper divisors (13952401).

251833961 is an equidigital number, since it uses as much as digits as its factorization.

251833961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697639 (or 697620 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 251833961 is about 15869.2772677271. The cubic root of 251833961 is about 631.4972041501.

The spelling of 251833961 in words is "two hundred fifty-one million, eight hundred thirty-three thousand, nine hundred sixty-one".