51511401 has 12 divisors (see below), whose sum is σ = 74529780. Its totient is φ = 34283520.

The previous prime is 51511393. The next prime is 51511403. The reversal of 51511401 is 10411515.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22610025 + 28901376 = 4755^2 + 5376^2 .

It is not a de Polignac number, because 51511401 - 2³ = 51511393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51511403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1305 + ... + 10233.

It is an arithmetic number, because the mean of its divisors is an integer number (6210815).

Almost surely, 2^51511401 is an apocalyptic number.

It is an amenable number.

51511401 is a deficient number, since it is larger than the sum of its proper divisors (23018379).

51511401 is a wasteful number, since it uses less digits than its factorization.

51511401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576 (or 9573 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 51511401 is about 7177.1443485554. The cubic root of 51511401 is about 372.0783957218.

Adding to 51511401 its reverse (10411515), we get a palindrome (61922916).

The spelling of 51511401 in words is "fifty-one million, five hundred eleven thousand, four hundred one".