1261252494 has 24 divisors (see below), whose sum is σ = 2754236160. Its totient is φ = 417106368.

The previous prime is 1261252481. The next prime is 1261252507. The reversal of 1261252494 is 4942521621.

It is a happy number.

1261252494 is a `hidden beast` number, since 12 + 612 + 5 + 24 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1261252481) and next prime (1261252507).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273579 + ... + 278150.

It is an arithmetic number, because the mean of its divisors is an integer number (114759840).

Almost surely, 2^1261252494 is an apocalyptic number.

1261252494 is an abundant number, since it is smaller than the sum of its proper divisors (1492983666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261252494 is a wasteful number, since it uses less digits than its factorization.

1261252494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551864 (or 551861 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1261252494 is about 35514.1168269746. The cubic root of 1261252494 is about 1080.4400624351.

The spelling of 1261252494 in words is "one billion, two hundred sixty-one million, two hundred fifty-two thousand, four hundred ninety-four".