1551004561 has 8 divisors (see below), whose sum is σ = 1663441920. Its totient is φ = 1441647792.

The previous prime is 1551004547. The next prime is 1551004589. The reversal of 1551004561 is 1654001551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1551004561 - 2²⁹ = 1014133649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551004541) 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, 769105 + ... + 771118.

It is an arithmetic number, because the mean of its divisors is an integer number (207930240).

Almost surely, 2^1551004561 is an apocalyptic number.

It is an amenable number.

1551004561 is a deficient number, since it is larger than the sum of its proper divisors (112437359).

1551004561 is a wasteful number, since it uses less digits than its factorization.

1551004561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540295.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1551004561 is about 39382.7952410694. The cubic root of 1551004561 is about 1157.5444889580.

The spelling of 1551004561 in words is "one billion, five hundred fifty-one million, four thousand, five hundred sixty-one".