153987997 has 2 divisors, whose sum is σ = 153987998. Its totient is φ = 153987996.

The previous prime is 153987983. The next prime is 153988001. The reversal of 153987997 is 799789351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115906756 + 38081241 = 10766^2 + 6171^2 .

It is an emirp because it is prime and its reverse (799789351) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153987997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (153987937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76993998 + 76993999.

It is an arithmetic number, because the mean of its divisors is an integer number (76993999).

Almost surely, 2^153987997 is an apocalyptic number.

It is an amenable number.

153987997 is a deficient number, since it is larger than the sum of its proper divisors (1).

153987997 is an equidigital number, since it uses as much as digits as its factorization.

153987997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 58.

The square root of 153987997 is about 12409.1900219152. The cubic root of 153987997 is about 535.9969148946.

The spelling of 153987997 in words is "one hundred fifty-three million, nine hundred eighty-seven thousand, nine hundred ninety-seven".