1138891611461 has 4 divisors (see below), whose sum is σ = 1138893808812. Its totient is φ = 1138889414112.

The previous prime is 1138891611427. The next prime is 1138891611479. The reversal of 1138891611461 is 1641161988311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 982415986561 + 156475624900 = 991169^2 + 395570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138891611461 - 2⁶ = 1138891611397 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 (1138891611761) 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, 157625 + ... + 1517441.

It is an arithmetic number, because the mean of its divisors is an integer number (284723452203).

Almost surely, 2^{1138891611461} is an apocalyptic number.

It is an amenable number.

1138891611461 is a deficient number, since it is larger than the sum of its proper divisors (2197351).

1138891611461 is an equidigital number, since it uses as much as digits as its factorization.

1138891611461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197350.

The product of its digits is 248832, while the sum is 50.

The spelling of 1138891611461 in words is "one trillion, one hundred thirty-eight billion, eight hundred ninety-one million, six hundred eleven thousand, four hundred sixty-one".