1213847131 has 8 divisors (see below), whose sum is σ = 1389696480. Its totient is φ = 1038608448.

The previous prime is 1213847119. The next prime is 1213847147. The reversal of 1213847131 is 1317483121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213847131 - 2⁵ = 1213847099 is a prime.

It is a super-2 number, since 2×1213847131² = 2946849714873862322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213847093 and 1213847102.

It is not an unprimeable number, because it can be changed into a prime (1213847111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148396 + ... + 156361.

It is an arithmetic number, because the mean of its divisors is an integer number (173712060).

Almost surely, 2^1213847131 is an apocalyptic number.

1213847131 is a deficient number, since it is larger than the sum of its proper divisors (175849349).

1213847131 is an equidigital number, since it uses as much as digits as its factorization.

1213847131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305333.

The product of its digits is 4032, while the sum is 31.

The square root of 1213847131 is about 34840.3089969076. The cubic root of 1213847131 is about 1066.7303839650.

The spelling of 1213847131 in words is "one billion, two hundred thirteen million, eight hundred forty-seven thousand, one hundred thirty-one".