1951771540 has 48 divisors (see below), whose sum is σ = 4165185024. Its totient is φ = 768096000.

The previous prime is 1951771537. The next prime is 1951771567. The reversal of 1951771540 is 451771591.

It is a junction number, because it is equal to n+sod(n) for n = 1951771493 and 1951771502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852277 + ... + 854563.

It is an arithmetic number, because the mean of its divisors is an integer number (86774688).

Almost surely, 2^1951771540 is an apocalyptic number.

1951771540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1951771540 is an abundant number, since it is smaller than the sum of its proper divisors (2213413484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1951771540 is a wasteful number, since it uses less digits than its factorization.

1951771540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968 (or 2966 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 40.

The square root of 1951771540 is about 44178.8585185267. The cubic root of 1951771540 is about 1249.7111951452.

The spelling of 1951771540 in words is "one billion, nine hundred fifty-one million, seven hundred seventy-one thousand, five hundred forty".