1438531061 has 4 divisors (see below), whose sum is σ = 1569306624. Its totient is φ = 1307755500.

The previous prime is 1438531057. The next prime is 1438531093. The reversal of 1438531061 is 1601358341.

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 an emirpimes, since its reverse is a distinct semiprime: 1601358341 = 11 ⋅145578031.

It is a cyclic number.

It is not a de Polignac number, because 1438531061 - 2² = 1438531057 is a prime.

It is a super-2 number, since 2×1438531061² = 4138743226923571442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438531261) 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, 65387765 + ... + 65387786.

It is an arithmetic number, because the mean of its divisors is an integer number (392326656).

Almost surely, 2^1438531061 is an apocalyptic number.

1438531061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1438531061 is a deficient number, since it is larger than the sum of its proper divisors (130775563).

1438531061 is a wasteful number, since it uses less digits than its factorization.

1438531061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130775562.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1438531061 is about 37927.9720127507. The cubic root of 1438531061 is about 1128.8591249837.

The spelling of 1438531061 in words is "one billion, four hundred thirty-eight million, five hundred thirty-one thousand, sixty-one".