1051862991 has 4 divisors (see below), whose sum is σ = 1402483992. Its totient is φ = 701241992.

The previous prime is 1051862989. The next prime is 1051863017. The reversal of 1051862991 is 1992681501.

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 1051862991 - 2¹ = 1051862989 is a prime.

It is a super-2 number, since 2×1051862991² = 2212831503670932162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051862921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175310496 + ... + 175310501.

It is an arithmetic number, because the mean of its divisors is an integer number (350620998).

Almost surely, 2^1051862991 is an apocalyptic number.

1051862991 is a deficient number, since it is larger than the sum of its proper divisors (350621001).

1051862991 is an equidigital number, since it uses as much as digits as its factorization.

1051862991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350621000.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1051862991 is about 32432.4373274658. The cubic root of 1051862991 is about 1016.9971245866.

The spelling of 1051862991 in words is "one billion, fifty-one million, eight hundred sixty-two thousand, nine hundred ninety-one".