1237998997 has 2 divisors, whose sum is σ = 1237998998. Its totient is φ = 1237998996.

The previous prime is 1237998917. The next prime is 1237999003. The reversal of 1237998997 is 7998997321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230676561 + 7322436 = 35081^2 + 2706^2 .

It is a cyclic number.

It is not a de Polignac number, because 1237998997 - 2⁷ = 1237998869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1237998907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618999498 + 618999499.

It is an arithmetic number, because the mean of its divisors is an integer number (618999499).

Almost surely, 2^1237998997 is an apocalyptic number.

It is an amenable number.

1237998997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1237998997 is an equidigital number, since it uses as much as digits as its factorization.

1237998997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15431472, while the sum is 64.

The square root of 1237998997 is about 35185.2099183734. The cubic root of 1237998997 is about 1073.7588696180.

The spelling of 1237998997 in words is "one billion, two hundred thirty-seven million, nine hundred ninety-eight thousand, nine hundred ninety-seven".