1811961534 has 32 divisors (see below), whose sum is σ = 3681694080. Its totient is φ = 594376992.

The previous prime is 1811961457. The next prime is 1811961559. The reversal of 1811961534 is 4351691181.

It is a junction number, because it is equal to n+sod(n) for n = 1811961492 and 1811961501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598677 + ... + 601695.

It is an arithmetic number, because the mean of its divisors is an integer number (115052940).

Almost surely, 2^1811961534 is an apocalyptic number.

1811961534 is an abundant number, since it is smaller than the sum of its proper divisors (1869732546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1811961534 is a wasteful number, since it uses less digits than its factorization.

1811961534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584.

The product of its digits is 25920, while the sum is 39.

The square root of 1811961534 is about 42567.1414826037. The cubic root of 1811961534 is about 1219.1289881661.

The spelling of 1811961534 in words is "one billion, eight hundred eleven million, nine hundred sixty-one thousand, five hundred thirty-four".