1954612861 has 4 divisors (see below), whose sum is σ = 1955105152. Its totient is φ = 1954120572.

The previous prime is 1954612817. The next prime is 1954612871. The reversal of 1954612861 is 1682164591.

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-1954612861 is a prime.

It is a super-2 number, since 2×1954612861² = 7641022872773210642, 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 (1954612871) 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, 240141 + ... + 248146.

It is an arithmetic number, because the mean of its divisors is an integer number (488776288).

Almost surely, 2^1954612861 is an apocalyptic number.

It is an amenable number.

1954612861 is a deficient number, since it is larger than the sum of its proper divisors (492291).

1954612861 is an equidigital number, since it uses as much as digits as its factorization.

1954612861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492290.

The product of its digits is 103680, while the sum is 43.

The square root of 1954612861 is about 44211.0038451967. The cubic root of 1954612861 is about 1250.3173297813.

The spelling of 1954612861 in words is "one billion, nine hundred fifty-four million, six hundred twelve thousand, eight hundred sixty-one".