1901570449 has 3 divisors (see below), whose sum is σ = 1901614057. Its totient is φ = 1901526842.

The previous prime is 1901570431. The next prime is 1901570519. The reversal of 1901570449 is 9440751091.

The square root of 1901570449 is 43607.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9440751091 = 47917 ⋅197023.

It is not a de Polignac number, because 1901570449 - 2¹⁵ = 1901537681 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901570849) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21804 + ... + 65410.

Almost surely, 2^1901570449 is an apocalyptic number.

1901570449 is the 43607-th square number.

1901570449 is the 21804-th centered octagonal number.

It is an amenable number.

1901570449 is a deficient number, since it is larger than the sum of its proper divisors (43608).

1901570449 is an frugal number, since it uses more digits than its factorization.

1901570449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87214 (or 43607 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The cubic root of 1901570449 is about 1238.9034810880.

The spelling of 1901570449 in words is "one billion, nine hundred one million, five hundred seventy thousand, four hundred forty-nine".