1245140761 has 16 divisors (see below), whose sum is σ = 1325148160. Its totient is φ = 1167877440.

The previous prime is 1245140749. The next prime is 1245140773. The reversal of 1245140761 is 1670415421.

It is an interprime number because it is at equal distance from previous prime (1245140749) and next prime (1245140773).

It is a cyclic number.

It is not a de Polignac number, because 1245140761 - 2⁹ = 1245140249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245140461) 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, 315760 + ... + 319678.

It is an arithmetic number, because the mean of its divisors is an integer number (82821760).

Almost surely, 2^1245140761 is an apocalyptic number.

It is an amenable number.

1245140761 is a deficient number, since it is larger than the sum of its proper divisors (80007399).

1245140761 is a wasteful number, since it uses less digits than its factorization.

1245140761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1245140761 is about 35286.5521268372. The cubic root of 1245140761 is about 1075.8196772788.

The spelling of 1245140761 in words is "one billion, two hundred forty-five million, one hundred forty thousand, seven hundred sixty-one".