1249999997 has 2 divisors, whose sum is σ = 1249999998. Its totient is φ = 1249999996.

The previous prime is 1249999991. The next prime is 1250000027. The reversal of 1249999997 is 7999999421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1225980196 + 24019801 = 35014^2 + 4901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249999997 - 2⁸ = 1249999741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624999998 + 624999999.

It is an arithmetic number, because the mean of its divisors is an integer number (624999999).

Almost surely, 2^1249999997 is an apocalyptic number.

It is an amenable number.

1249999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249999997 is an equidigital number, since it uses as much as digits as its factorization.

1249999997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29760696, while the sum is 68.

The square root of 1249999997 is about 35355.3390169010. The cubic root of 1249999997 is about 1077.2173441542.

The spelling of 1249999997 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".