1551545408 has 140 divisors (see below), whose sum is σ = 3756477120. Its totient is φ = 634588416.

The previous prime is 1551545407. The next prime is 1551545417. The reversal of 1551545408 is 8045451551.

It is not an unprimeable number, because it can be changed into a prime (1551545407) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3534053 + ... + 3534491.

Almost surely, 2^1551545408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551545408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878238560).

1551545408 is an abundant number, since it is smaller than the sum of its proper divisors (2204931712).

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

1551545408 is an frugal number, since it uses more digits than its factorization.

1551545408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 38.

The square root of 1551545408 is about 39389.6611815842. The cubic root of 1551545408 is about 1157.6790214892.

Adding to 1551545408 its reverse (8045451551), we get a palindrome (9596996959).

The spelling of 1551545408 in words is "one billion, five hundred fifty-one million, five hundred forty-five thousand, four hundred eight".