1611531252 has 36 divisors (see below), whose sum is σ = 4313217636. Its totient is φ = 505578240.

The previous prime is 1611531241. The next prime is 1611531287. The reversal of 1611531252 is 2521351161.

It can be written as a sum of positive squares in 2 ways, for example, as 902161296 + 709369956 = 30036^2 + 26634^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1315999 + ... + 1317222.

It is an arithmetic number, because the mean of its divisors is an integer number (119811601).

Almost surely, 2^1611531252 is an apocalyptic number.

1611531252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1611531252 is an abundant number, since it is smaller than the sum of its proper divisors (2701686384).

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

1611531252 is a wasteful number, since it uses less digits than its factorization.

1611531252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633248 (or 2633243 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 1611531252 is about 40143.8818750753. The cubic root of 1611531252 is about 1172.4101708617.

The spelling of 1611531252 in words is "one billion, six hundred eleven million, five hundred thirty-one thousand, two hundred fifty-two".