1251201543 has 8 divisors (see below), whose sum is σ = 1668461808. Its totient is φ = 834037824.

The previous prime is 1251201503. The next prime is 1251201599. The reversal of 1251201543 is 3451021521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251201543 - 2⁹ = 1251201031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251201503) 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, 15321 + ... + 52317.

It is an arithmetic number, because the mean of its divisors is an integer number (208557726).

Almost surely, 2^1251201543 is an apocalyptic number.

1251201543 is a deficient number, since it is larger than the sum of its proper divisors (417260265).

1251201543 is a wasteful number, since it uses less digits than its factorization.

1251201543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48273.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1251201543 is about 35372.3273619365. The cubic root of 1251201543 is about 1077.5623872735.

The spelling of 1251201543 in words is "one billion, two hundred fifty-one million, two hundred one thousand, five hundred forty-three".