1551042420 has 48 divisors (see below), whose sum is σ = 4348296960. Its totient is φ = 413099136.

The previous prime is 1551042401. The next prime is 1551042439. The reversal of 1551042420 is 242401551.

It is an interprime number because it is at equal distance from previous prime (1551042401) and next prime (1551042439).

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, 34149 + ... + 65331.

It is an arithmetic number, because the mean of its divisors is an integer number (90589520).

Almost surely, 2^1551042420 is an apocalyptic number.

1551042420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551042420 is an abundant number, since it is smaller than the sum of its proper divisors (2797254540).

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

1551042420 is a wasteful number, since it uses less digits than its factorization.

1551042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32024 (or 32022 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1551042420 is about 39383.2758921855. The cubic root of 1551042420 is about 1157.5539071809.

Adding to 1551042420 its reverse (242401551), we get a palindrome (1793443971).

The spelling of 1551042420 in words is "one billion, five hundred fifty-one million, forty-two thousand, four hundred twenty".