1550868481 has 4 divisors (see below), whose sum is σ = 1550958592. Its totient is φ = 1550778372.

The previous prime is 1550868463. The next prime is 1550868493. The reversal of 1550868481 is 1848680551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1550868481 is a prime.

It is a super-2 number, since 2×1550868481² = 4810386090718494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550868581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10305 + ... + 56638.

It is an arithmetic number, because the mean of its divisors is an integer number (387739648).

Almost surely, 2^1550868481 is an apocalyptic number.

It is an amenable number.

1550868481 is a deficient number, since it is larger than the sum of its proper divisors (90111).

1550868481 is an equidigital number, since it uses as much as digits as its factorization.

1550868481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90110.

The product of its (nonzero) digits is 307200, while the sum is 46.

The square root of 1550868481 is about 39381.0675452050. The cubic root of 1550868481 is about 1157.5106349288.

The spelling of 1550868481 in words is "one billion, five hundred fifty million, eight hundred sixty-eight thousand, four hundred eighty-one".