1251262949 has 4 divisors (see below), whose sum is σ = 1251756000. Its totient is φ = 1250769900.

The previous prime is 1251262921. The next prime is 1251262963. The reversal of 1251262949 is 9492621521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1251262949 - 2⁸ = 1251262693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251262919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242699 + ... + 247800.

It is an arithmetic number, because the mean of its divisors is an integer number (312939000).

Almost surely, 2^1251262949 is an apocalyptic number.

It is an amenable number.

1251262949 is a deficient number, since it is larger than the sum of its proper divisors (493051).

1251262949 is an equidigital number, since it uses as much as digits as its factorization.

1251262949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493050.

The product of its digits is 77760, while the sum is 41.

The square root of 1251262949 is about 35373.1953461940. The cubic root of 1251262949 is about 1077.5800150527.

The spelling of 1251262949 in words is "one billion, two hundred fifty-one million, two hundred sixty-two thousand, nine hundred forty-nine".