1261903454 has 16 divisors (see below), whose sum is σ = 2165170176. Its totient is φ = 540339000.

The previous prime is 1261903451. The next prime is 1261903459. The reversal of 1261903454 is 4543091621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261903451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23042 + ... + 55269.

It is an arithmetic number, because the mean of its divisors is an integer number (135323136).

Almost surely, 2^1261903454 is an apocalyptic number.

1261903454 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1261903454 is a deficient number, since it is larger than the sum of its proper divisors (903266722).

1261903454 is a wasteful number, since it uses less digits than its factorization.

1261903454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79471.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1261903454 is about 35523.2804509944. The cubic root of 1261903454 is about 1080.6259100484.

The spelling of 1261903454 in words is "one billion, two hundred sixty-one million, nine hundred three thousand, four hundred fifty-four".