1601021356 has 24 divisors (see below), whose sum is σ = 3090845520. Its totient is φ = 719558400.

The previous prime is 1601021351. The next prime is 1601021399. The reversal of 1601021356 is 6531201061.

1601021356 = T₁₇₀₅₆ + T₁₇₀₅₇ + ... + T₁₇₀₆₆.

It is a self number, because there is not a number n which added to its sum of digits gives 1601021356.

It is not an unprimeable number, because it can be changed into a prime (1601021351) 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, 200505 + ... + 208336.

It is an arithmetic number, because the mean of its divisors is an integer number (128785230).

Almost surely, 2^1601021356 is an apocalyptic number.

It is an amenable number.

1601021356 is a deficient number, since it is larger than the sum of its proper divisors (1489824164).

1601021356 is a wasteful number, since it uses less digits than its factorization.

1601021356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408945 (or 408943 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1601021356 is about 40012.7649132124. The cubic root of 1601021356 is about 1169.8559142701.

The spelling of 1601021356 in words is "one billion, six hundred one million, twenty-one thousand, three hundred fifty-six".