1054997861 has 4 divisors (see below), whose sum is σ = 1077444672. Its totient is φ = 1032551052.

The previous prime is 1054997831. The next prime is 1054997941. The reversal of 1054997861 is 1687994501.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1054997861 is a prime.

It is a super-2 number, since 2×1054997861² = 2226040973429150642, 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 (1054997831) 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, 11223335 + ... + 11223428.

It is an arithmetic number, because the mean of its divisors is an integer number (269361168).

Almost surely, 2^1054997861 is an apocalyptic number.

It is an amenable number.

1054997861 is a deficient number, since it is larger than the sum of its proper divisors (22446811).

1054997861 is an equidigital number, since it uses as much as digits as its factorization.

1054997861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22446810.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1054997861 is about 32480.7306106251. The cubic root of 1054997861 is about 1018.0064422816.

The spelling of 1054997861 in words is "one billion, fifty-four million, nine hundred ninety-seven thousand, eight hundred sixty-one".