2155243490 has 16 divisors (see below), whose sum is σ = 3880899000. Its totient is φ = 861772800.

The previous prime is 2155243481. The next prime is 2155243499. The reversal of 2155243490 is 943425512.

It is an interprime number because it is at equal distance from previous prime (2155243481) and next prime (2155243499).

It can be written as a sum of positive squares in 4 ways, for example, as 1977847729 + 177395761 = 44473^2 + 13319^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2155243490.

It is not an unprimeable number, because it can be changed into a prime (2155243499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11711 + ... + 66690.

Almost surely, 2^2155243490 is an apocalyptic number.

2155243490 is a deficient number, since it is larger than the sum of its proper divisors (1725655510).

2155243490 is a wasteful number, since it uses less digits than its factorization.

2155243490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81157.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 2155243490 is about 46424.6000521275. The cubic root of 2155243490 is about 1291.7112657418.

The spelling of 2155243490 in words is "two billion, one hundred fifty-five million, two hundred forty-three thousand, four hundred ninety".