1551049091 has 8 divisors (see below), whose sum is σ = 1619585280. Its totient is φ = 1482604552.

The previous prime is 1551049069. The next prime is 1551049099. The reversal of 1551049091 is 1909401551.

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 1551049091 - 2¹⁸ = 1550786947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551049099) 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, 12890 + ... + 57168.

It is an arithmetic number, because the mean of its divisors is an integer number (202448160).

Almost surely, 2^1551049091 is an apocalyptic number.

1551049091 is a deficient number, since it is larger than the sum of its proper divisors (68536189).

1551049091 is a wasteful number, since it uses less digits than its factorization.

1551049091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45825.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 1551049091 is about 39383.3605854046. The cubic root of 1551049091 is about 1157.5555667167. Note that the first 4 decimals are identical.

The spelling of 1551049091 in words is "one billion, five hundred fifty-one million, forty-nine thousand, ninety-one".