1900091445 has 32 divisors (see below), whose sum is σ = 3678835968. Its totient is φ = 817517568.

The previous prime is 1900091443. The next prime is 1900091449. The reversal of 1900091445 is 5441900091.

It is not a de Polignac number, because 1900091445 - 2¹ = 1900091443 is a prime.

It is a super-2 number, since 2×1900091445² = 7220694998724376050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900091441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 530454 + ... + 534023.

It is an arithmetic number, because the mean of its divisors is an integer number (114963624).

Almost surely, 2^1900091445 is an apocalyptic number.

1900091445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1900091445 is a deficient number, since it is larger than the sum of its proper divisors (1778744523).

1900091445 is a wasteful number, since it uses less digits than its factorization.

1900091445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064509.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1900091445 is about 43590.0383688751. The cubic root of 1900091445 is about 1238.5821995451.

The spelling of 1900091445 in words is "one billion, nine hundred million, ninety-one thousand, four hundred forty-five".