250971997 has 4 divisors (see below), whose sum is σ = 253995840. Its totient is φ = 247948156.

The previous prime is 250971979. The next prime is 250972039. The reversal of 250971997 is 799179052.

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 250971997 - 2²⁷ = 116754269 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 250971997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250971937) 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, 1511797 + ... + 1511962.

It is an arithmetic number, because the mean of its divisors is an integer number (63498960).

Almost surely, 2^250971997 is an apocalyptic number.

It is an amenable number.

250971997 is a deficient number, since it is larger than the sum of its proper divisors (3023843).

250971997 is an equidigital number, since it uses as much as digits as its factorization.

250971997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023842.

The product of its (nonzero) digits is 357210, while the sum is 49.

The square root of 250971997 is about 15842.0957262605. The cubic root of 250971997 is about 630.7758954622.

The spelling of 250971997 in words is "two hundred fifty million, nine hundred seventy-one thousand, nine hundred ninety-seven".