1550220551 has 4 divisors (see below), whose sum is σ = 1691149704. Its totient is φ = 1409291400.

The previous prime is 1550220533. The next prime is 1550220569.

1550220551 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (1550220533) and next prime (1550220569).

It is a de Polignac number, because none of the positive numbers 2^k-1550220551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1550220551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550222551) 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, 70464560 + ... + 70464581.

It is an arithmetic number, because the mean of its divisors is an integer number (422787426).

Almost surely, 2^1550220551 is an apocalyptic number.

1550220551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1550220551 is a deficient number, since it is larger than the sum of its proper divisors (140929153).

1550220551 is a wasteful number, since it uses less digits than its factorization.

1550220551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140929152.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1550220551 is about 39372.8402709279. The cubic root of 1550220551 is about 1157.3494155124.

The spelling of 1550220551 in words is "one billion, five hundred fifty million, two hundred twenty thousand, five hundred fifty-one".