1261542898 has 32 divisors (see below), whose sum is σ = 2423023488. Its totient is φ = 478224000.

The previous prime is 1261542869. The next prime is 1261542907. The reversal of 1261542898 is 8982451621.

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 15 ways as a sum of consecutive naturals, for example, 105003 + ... + 116398.

It is an arithmetic number, because the mean of its divisors is an integer number (75719484).

Almost surely, 2^1261542898 is an apocalyptic number.

1261542898 is a deficient number, since it is larger than the sum of its proper divisors (1161480590).

1261542898 is a wasteful number, since it uses less digits than its factorization.

1261542898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221458.

The product of its digits is 276480, while the sum is 46.

The square root of 1261542898 is about 35518.2051629865. The cubic root of 1261542898 is about 1080.5229800213.

The spelling of 1261542898 in words is "one billion, two hundred sixty-one million, five hundred forty-two thousand, eight hundred ninety-eight".