1551242087 has 4 divisors (see below), whose sum is σ = 1553330640. Its totient is φ = 1549153536.

The previous prime is 1551242081. The next prime is 1551242113. The reversal of 1551242087 is 7802421551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1551242087 - 2¹⁶ = 1551176551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551242081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043162 + ... + 1044647.

It is an arithmetic number, because the mean of its divisors is an integer number (388332660).

Almost surely, 2^1551242087 is an apocalyptic number.

1551242087 is a deficient number, since it is larger than the sum of its proper divisors (2088553).

1551242087 is an equidigital number, since it uses as much as digits as its factorization.

1551242087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088552.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 1551242087 is about 39385.8107317851. The cubic root of 1551242087 is about 1157.6035760136.

The spelling of 1551242087 in words is "one billion, five hundred fifty-one million, two hundred forty-two thousand, eighty-seven".