1051991441 has 2 divisors, whose sum is σ = 1051991442. Its totient is φ = 1051991440.

The previous prime is 1051991429. The next prime is 1051991461. The reversal of 1051991441 is 1441991501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983449600 + 68541841 = 31360^2 + 8279^2 .

It is an emirp because it is prime and its reverse (1441991501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1051991441 - 2²² = 1047797137 is a prime.

It is a super-2 number, since 2×1051991441² = 2213371983874512962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051991461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525995720 + 525995721.

It is an arithmetic number, because the mean of its divisors is an integer number (525995721).

Almost surely, 2^1051991441 is an apocalyptic number.

It is an amenable number.

1051991441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051991441 is an equidigital number, since it uses as much as digits as its factorization.

1051991441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1051991441 is about 32434.4175375480. The cubic root of 1051991441 is about 1017.0385203339.

The spelling of 1051991441 in words is "one billion, fifty-one million, nine hundred ninety-one thousand, four hundred forty-one".