1551555252 has 288 divisors, whose sum is σ = 4777194240. Its totient is φ = 419696640.

The previous prime is 1551555241. The next prime is 1551555253. The reversal of 1551555252 is 2525551551.

1551555252 is a `hidden beast` number, since 1 + 5 + 51 + 5 + 552 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551555253) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11162199 + ... + 11162337.

It is an arithmetic number, because the mean of its divisors is an integer number (16587480).

Almost surely, 2^1551555252 is an apocalyptic number.

1551555252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551555252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388597120).

1551555252 is an abundant number, since it is smaller than the sum of its proper divisors (3225638988).

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

1551555252 is a wasteful number, since it uses less digits than its factorization.

1551555252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 258 counting only the distinct ones).

The product of its digits is 62500, while the sum is 36.

The square root of 1551555252 is about 39389.7861380333. The cubic root of 1551555252 is about 1157.6814698369.

The spelling of 1551555252 in words is "one billion, five hundred fifty-one million, five hundred fifty-five thousand, two hundred fifty-two".