381409551 has 12 divisors (see below), whose sum is σ = 557899680. Its totient is φ = 251053920.

The previous prime is 381409549. The next prime is 381409573. The reversal of 381409551 is 155904183.

It is not a de Polignac number, because 381409551 - 2¹ = 381409549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381409531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 267510 + ... + 268931.

It is an arithmetic number, because the mean of its divisors is an integer number (46491640).

Almost surely, 2^381409551 is an apocalyptic number.

381409551 is a deficient number, since it is larger than the sum of its proper divisors (176490129).

381409551 is a wasteful number, since it uses less digits than its factorization.

381409551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536526 (or 536523 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 381409551 is about 19529.7094448433. The cubic root of 381409551 is about 725.2101180914.

The spelling of 381409551 in words is "three hundred eighty-one million, four hundred nine thousand, five hundred fifty-one".