1249597901 has 2 divisors, whose sum is σ = 1249597902. Its totient is φ = 1249597900.

The previous prime is 1249597897. The next prime is 1249597919. The reversal of 1249597901 is 1097959421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1066022500 + 183575401 = 32650^2 + 13549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249597901 - 2² = 1249597897 is a prime.

It is a super-2 number, since 2×1249597901² = 3122989828367211602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249593901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624798950 + 624798951.

It is an arithmetic number, because the mean of its divisors is an integer number (624798951).

Almost surely, 2^1249597901 is an apocalyptic number.

It is an amenable number.

1249597901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249597901 is an equidigital number, since it uses as much as digits as its factorization.

1249597901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 1249597901 is about 35349.6520633513. The cubic root of 1249597901 is about 1077.1018264905.

The spelling of 1249597901 in words is "one billion, two hundred forty-nine million, five hundred ninety-seven thousand, nine hundred one".