1550785401 has 24 divisors (see below), whose sum is σ = 2466097920. Its totient is φ = 931240800.

The previous prime is 1550785393. The next prime is 1550785433. The reversal of 1550785401 is 1045870551.

It is not a de Polignac number, because 1550785401 - 2³ = 1550785393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1550785601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61065 + ... + 82646.

It is an arithmetic number, because the mean of its divisors is an integer number (102754080).

Almost surely, 2^1550785401 is an apocalyptic number.

1550785401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1550785401 is a deficient number, since it is larger than the sum of its proper divisors (915312519).

1550785401 is a wasteful number, since it uses less digits than its factorization.

1550785401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143837 (or 143834 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 1550785401 is about 39380.0127094952. The cubic root of 1550785401 is about 1157.4899652842.

The spelling of 1550785401 in words is "one billion, five hundred fifty million, seven hundred eighty-five thousand, four hundred one".