51101001 has 12 divisors (see below), whose sum is σ = 84357312. Its totient is φ = 29200536.

The previous prime is 51100999. The next prime is 51101003. The reversal of 51101001 is 10010115.

It is an interprime number because it is at equal distance from previous prime (51100999) and next prime (51101003).

It is not a de Polignac number, because 51101001 - 2¹ = 51100999 is a prime.

It is a super-2 number, since 2×51101001² = 5222624606404002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (51101003) 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, 405501 + ... + 405626.

It is an arithmetic number, because the mean of its divisors is an integer number (7029776).

Almost surely, 2^51101001 is an apocalyptic number.

It is an amenable number.

51101001 is a deficient number, since it is larger than the sum of its proper divisors (33256311).

51101001 is a wasteful number, since it uses less digits than its factorization.

51101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811140 (or 811137 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 9.

The square root of 51101001 is about 7148.4964153310. The cubic root of 51101001 is about 371.0876227626.

Adding to 51101001 its reverse (10010115), we get a palindrome (61111116).

The spelling of 51101001 in words is "fifty-one million, one hundred one thousand, one".