1145121551 has 16 divisors (see below), whose sum is σ = 1335057984. Its totient is φ = 961818624.

The previous prime is 1145121541. The next prime is 1145121557. The reversal of 1145121551 is 1551215411.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145121551 is a prime.

It is a super-2 number, since 2×1145121551² = 2622606733129291202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1145121551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145121557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426425 + ... + 429101.

It is an arithmetic number, because the mean of its divisors is an integer number (83441124).

Almost surely, 2^1145121551 is an apocalyptic number.

1145121551 is a deficient number, since it is larger than the sum of its proper divisors (189936433).

1145121551 is a wasteful number, since it uses less digits than its factorization.

1145121551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890.

The product of its digits is 1000, while the sum is 26.

The square root of 1145121551 is about 33839.6446642101. The cubic root of 1145121551 is about 1046.2059750701.

Adding to 1145121551 its reverse (1551215411), we get a palindrome (2696336962).

The spelling of 1145121551 in words is "one billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred fifty-one".