1351221939 has 32 divisors (see below), whose sum is σ = 2018894400. Its totient is φ = 893168640.

The previous prime is 1351221923. The next prime is 1351221959. The reversal of 1351221939 is 9391221531.

It is not a de Polignac number, because 1351221939 - 2⁴ = 1351221923 is a prime.

It is a super-3 number, since 3×1351221939³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1351221959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2374447 + ... + 2375015.

It is an arithmetic number, because the mean of its divisors is an integer number (63090450).

Almost surely, 2^1351221939 is an apocalyptic number.

1351221939 is a deficient number, since it is larger than the sum of its proper divisors (667672461).

1351221939 is a wasteful number, since it uses less digits than its factorization.

1351221939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172 (or 1166 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 1351221939 is about 36758.9708642666. The cubic root of 1351221939 is about 1105.5428054615.

The spelling of 1351221939 in words is "one billion, three hundred fifty-one million, two hundred twenty-one thousand, nine hundred thirty-nine".