1213381377 has 48 divisors (see below), whose sum is σ = 1977288768. Its totient is φ = 739108800.

The previous prime is 1213381339. The next prime is 1213381381. The reversal of 1213381377 is 7731833121.

It is not a de Polignac number, because 1213381377 - 2¹⁴ = 1213364993 is a prime.

It is a super-2 number, since 2×1213381377² = 2944588732100832258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213381327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317158 + ... + 320960.

It is an arithmetic number, because the mean of its divisors is an integer number (41193516).

Almost surely, 2^1213381377 is an apocalyptic number.

It is an amenable number.

1213381377 is a deficient number, since it is larger than the sum of its proper divisors (763907391).

1213381377 is a wasteful number, since it uses less digits than its factorization.

1213381377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932 (or 3920 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1213381377 is about 34833.6242300453. The cubic root of 1213381377 is about 1066.5939314444.

The spelling of 1213381377 in words is "one billion, two hundred thirteen million, three hundred eighty-one thousand, three hundred seventy-seven".