1551257361 has 12 divisors (see below), whose sum is σ = 2372511492. Its totient is φ = 973337856.

The previous prime is 1551257359. The next prime is 1551257377. The reversal of 1551257361 is 1637521551.

It is a happy number.

1551257361 is a `hidden beast` number, since 15 + 5 + 12 + 573 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1159811136 + 391446225 = 34056^2 + 19785^2 .

It is not a de Polignac number, because 1551257361 - 2¹ = 1551257359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1551257321) 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, 5069316 + ... + 5069621.

It is an arithmetic number, because the mean of its divisors is an integer number (197709291).

Almost surely, 2^1551257361 is an apocalyptic number.

It is an amenable number.

1551257361 is a deficient number, since it is larger than the sum of its proper divisors (821254131).

1551257361 is a wasteful number, since it uses less digits than its factorization.

1551257361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138960 (or 10138957 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 1551257361 is about 39386.0046336259. The cubic root of 1551257361 is about 1157.6073753730.

The spelling of 1551257361 in words is "one billion, five hundred fifty-one million, two hundred fifty-seven thousand, three hundred sixty-one".