1047120781 has 4 divisors (see below), whose sum is σ = 1196709472. Its totient is φ = 897532092.

The previous prime is 1047120773. The next prime is 1047120787. The reversal of 1047120781 is 1870217401.

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: 1870217401 = 13 ⋅143862877.

It is a cyclic number.

It is not a de Polignac number, because 1047120781 - 2³ = 1047120773 is a prime.

It is a super-2 number, since 2×1047120781² = 2192923860004099922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1047120787) 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, 74794335 + ... + 74794348.

It is an arithmetic number, because the mean of its divisors is an integer number (299177368).

Almost surely, 2^1047120781 is an apocalyptic number.

It is an amenable number.

1047120781 is a deficient number, since it is larger than the sum of its proper divisors (149588691).

1047120781 is an equidigital number, since it uses as much as digits as its factorization.

1047120781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149588690.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 1047120781 is about 32359.2456803307. The cubic root of 1047120781 is about 1015.4664816879.

The spelling of 1047120781 in words is "one billion, forty-seven million, one hundred twenty thousand, seven hundred eighty-one".