1011554491 has 4 divisors (see below), whose sum is σ = 1021569984. Its totient is φ = 1001539000.

The previous prime is 1011554477. The next prime is 1011554497. The reversal of 1011554491 is 1944551101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1944551101 = 991 ⋅1962211.

It is a cyclic number.

It is not a de Polignac number, because 1011554491 - 2⁷ = 1011554363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011554497) 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, 5007595 + ... + 5007796.

It is an arithmetic number, because the mean of its divisors is an integer number (255392496).

Almost surely, 2^1011554491 is an apocalyptic number.

1011554491 is a deficient number, since it is larger than the sum of its proper divisors (10015493).

1011554491 is a wasteful number, since it uses less digits than its factorization.

1011554491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10015492.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 1011554491 is about 31804.9444426492. The cubic root of 1011554491 is about 1003.8367574656.

The spelling of 1011554491 in words is "one billion, eleven million, five hundred fifty-four thousand, four hundred ninety-one".