1251046541 has 4 divisors (see below), whose sum is σ = 1324637532. Its totient is φ = 1177455552.

The previous prime is 1251046529. The next prime is 1251046543. The reversal of 1251046541 is 1456401521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1456401521 = 1459 ⋅998219.

It can be written as a sum of positive squares in 2 ways, for example, as 614544100 + 636502441 = 24790^2 + 25229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251046541 - 2¹⁸ = 1250784397 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 (1251046543) 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, 36795470 + ... + 36795503.

It is an arithmetic number, because the mean of its divisors is an integer number (331159383).

Almost surely, 2^1251046541 is an apocalyptic number.

It is an amenable number.

1251046541 is a deficient number, since it is larger than the sum of its proper divisors (73590991).

1251046541 is an equidigital number, since it uses as much as digits as its factorization.

1251046541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73590990.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1251046541 is about 35370.1362875520. The cubic root of 1251046541 is about 1077.5178883879.

The spelling of 1251046541 in words is "one billion, two hundred fifty-one million, forty-six thousand, five hundred forty-one".