1551210561 has 8 divisors (see below), whose sum is σ = 2298089760. Its totient is φ = 1034140356.

The previous prime is 1551210553. The next prime is 1551210589. The reversal of 1551210561 is 1650121551.

1551210561 is a `hidden beast` number, since 1 + 551 + 2 + 105 + 6 + 1 = 666.

It is not a de Polignac number, because 1551210561 - 2³ = 1551210553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 57452243 = 1551210561 / (1 + 5 + 5 + 1 + 2 + 1 + 0 + 5 + 6 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1551210161) 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, 28726095 + ... + 28726148.

It is an arithmetic number, because the mean of its divisors is an integer number (287261220).

Almost surely, 2^1551210561 is an apocalyptic number.

It is an amenable number.

1551210561 is a deficient number, since it is larger than the sum of its proper divisors (746879199).

1551210561 is an equidigital number, since it uses as much as digits as its factorization.

1551210561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57452252 (or 57452246 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The square root of 1551210561 is about 39385.4105094767. The cubic root of 1551210561 is about 1157.5957339413.

The spelling of 1551210561 in words is "one billion, five hundred fifty-one million, two hundred ten thousand, five hundred sixty-one".