1251540454011 has 4 divisors (see below), whose sum is σ = 1668720605352. Its totient is φ = 834360302672.

The previous prime is 1251540453967. The next prime is 1251540454037. The reversal of 1251540454011 is 1104540451521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1251540454011 - 2¹¹ = 1251540451963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251540454061) 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, 208590075666 + ... + 208590075671.

It is an arithmetic number, because the mean of its divisors is an integer number (417180151338).

Almost surely, 2^{1251540454011} is an apocalyptic number.

1251540454011 is a deficient number, since it is larger than the sum of its proper divisors (417180151341).

1251540454011 is an equidigital number, since it uses as much as digits as its factorization.

1251540454011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417180151340.

The product of its (nonzero) digits is 16000, while the sum is 33.

The spelling of 1251540454011 in words is "one trillion, two hundred fifty-one billion, five hundred forty million, four hundred fifty-four thousand, eleven".