1601955 has 24 divisors (see below), whose sum is σ = 2812992. Its totient is φ = 843264.

The previous prime is 1601953. The next prime is 1601969. The reversal of 1601955 is 5591061.

1601955 is a `hidden beast` number, since 1 + 601 + 9 + 55 = 666.

It is not a de Polignac number, because 1601955 - 2¹ = 1601953 is a prime.

It is a super-3 number, since 3×1601955³ = 12333098259576176625, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1601953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4182 + ... + 4548.

It is an arithmetic number, because the mean of its divisors is an integer number (117208).

2^1601955 is an apocalyptic number.

1601955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1601955 is a deficient number, since it is larger than the sum of its proper divisors (1211037).

1601955 is a wasteful number, since it uses less digits than its factorization.

1601955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1601955 is about 1265.6836097540. The cubic root of 1601955 is about 117.0083272618.

It can be divided in two parts, 1601 and 955, that added together give a triangular number (2556 = T₇₁).

The spelling of 1601955 in words is "one million, six hundred one thousand, nine hundred fifty-five".