1381215501 has 24 divisors (see below), whose sum is σ = 2025539256. Its totient is φ = 906854400.

The previous prime is 1381215491. The next prime is 1381215529. The reversal of 1381215501 is 1055121831.

1381215501 is a `hidden beast` number, since 1 + 38 + 121 + 5 + 501 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 81540900 + 1299674601 = 9030^2 + 36051^2 .

It is not a de Polignac number, because 1381215501 - 2²⁶ = 1314106637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381215001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171501 + ... + 179373.

It is an arithmetic number, because the mean of its divisors is an integer number (84397469).

Almost surely, 2^1381215501 is an apocalyptic number.

It is an amenable number.

1381215501 is a deficient number, since it is larger than the sum of its proper divisors (644323755).

1381215501 is a wasteful number, since it uses less digits than its factorization.

1381215501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8173 (or 8170 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 1381215501 is about 37164.7077346237. The cubic root of 1381215501 is about 1113.6630603232.

The spelling of 1381215501 in words is "one billion, three hundred eighty-one million, two hundred fifteen thousand, five hundred one".