1051691945 has 8 divisors (see below), whose sum is σ = 1275041544. Its totient is φ = 832679424.

The previous prime is 1051691941. The next prime is 1051691987. The reversal of 1051691945 is 5491961501.

It can be written as a sum of positive squares in 4 ways, for example, as 3810304 + 1047881641 = 1952^2 + 32371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1051691945 - 2² = 1051691941 is a prime.

It is a super-2 number, since 2×1051691945² = 2212111894355766050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1051691941) 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 7 ways as a sum of consecutive naturals, for example, 1083734 + ... + 1084703.

It is an arithmetic number, because the mean of its divisors is an integer number (159380193).

Almost surely, 2^1051691945 is an apocalyptic number.

It is an amenable number.

1051691945 is a deficient number, since it is larger than the sum of its proper divisors (223349599).

1051691945 is an equidigital number, since it uses as much as digits as its factorization.

1051691945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168539.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 1051691945 is about 32429.8002614879. The cubic root of 1051691945 is about 1016.9419961395.

The spelling of 1051691945 in words is "one billion, fifty-one million, six hundred ninety-one thousand, nine hundred forty-five".