1621141754 has 16 divisors (see below), whose sum is σ = 2514213000. Its totient is φ = 783365184.

The previous prime is 1621141741. The next prime is 1621141757. The reversal of 1621141754 is 4571411261.

It can be written as a sum of positive squares in 4 ways, for example, as 1572519025 + 48622729 = 39655^2 + 6973^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621141754.

It is not an unprimeable number, because it can be changed into a prime (1621141757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62489 + ... + 84540.

Almost surely, 2^1621141754 is an apocalyptic number.

1621141754 is a deficient number, since it is larger than the sum of its proper divisors (893071246).

1621141754 is a wasteful number, since it uses less digits than its factorization.

1621141754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147217.

The product of its digits is 6720, while the sum is 32.

The square root of 1621141754 is about 40263.4046498803. The cubic root of 1621141754 is about 1174.7361421106.

The spelling of 1621141754 in words is "one billion, six hundred twenty-one million, one hundred forty-one thousand, seven hundred fifty-four".