250515989 has 2 divisors, whose sum is σ = 250515990. Its totient is φ = 250515988.

The previous prime is 250515943. The next prime is 250516033. The reversal of 250515989 is 989515052.

It is an a-pointer prime, because the next prime (250516033) can be obtained adding 250515989 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205692964 + 44823025 = 14342^2 + 6695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-250515989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250515919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125257994 + 125257995.

It is an arithmetic number, because the mean of its divisors is an integer number (125257995).

Almost surely, 2^250515989 is an apocalyptic number.

It is an amenable number.

250515989 is a deficient number, since it is larger than the sum of its proper divisors (1).

250515989 is an equidigital number, since it uses as much as digits as its factorization.

250515989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 44.

The square root of 250515989 is about 15827.6968950002. The cubic root of 250515989 is about 630.3936307153.

The spelling of 250515989 in words is "two hundred fifty million, five hundred fifteen thousand, nine hundred eighty-nine".